Ques:- 10 books are placed at random in a shelf. The probability that a pair of books will always be together is -.
Recent Answer : Added by Mahomed On 2021-08-24 15:05:46:
All books can be arranged in 10! ways. A single pair of books can be taken as a unit and arranged among the 8 others in 9! ways. The pair of books can also be interchanged and therefore rearranged in 2! ways. Thus the probability of the pair always being together is (9!*2!)/10!
Ques:- How is my mother’s mother’s only son-in-law’s sister related to me ?
Recent Answer : Added by Atif On 2022-12-05 16:13:29:
Father’s sister
Ques:- How many numbers greater than 5000 can be formed with four of the digits 3, 4, 5, 6, 7 where no digit can be repeated
Recent Answer : Added by Admin On 2022-09-29 17:47:29:
When none of the digits are repeated:
The hundred’s place can be filled by any of the digits: 2, 3, 5, 6, 7 or 8 except the one which has already been used at the thousand’s place, so it can be filled in 5 ways.
Similarly tens’ place can be filled in 4 ways: only those 4 numbers which have not been use either at hundred’s or thousand’s place.
Unit’s place can be filled in only 3 ways. So, total number of nos. Possible =4×5×4×3= 240
Ques:- X and Y starts a business with Rs.8000 each, and after 4 months, Y withdraws half of his capital . How should they share the profits at the end of the 18 months?
Recent Answer : Added by Admin On 2022-09-29 16:03:06:
x:y=18:11
Ques:- A part of certain sum of money is invested at 9% per annum and the rest at 12% per annum, if the interest earned in each case for the same period is equal, then ratio of the sums invested is?
Recent Answer : Added by uma On 2022-02-20 07:56:22:
3;4
Ques:- Four persons have to cross the bridge they are having one torch light. Four persons take 1,2,5,10 minutes respectively, when two persons are going they will take the time of the slowest person. What is the time taken to cross by all of them.
Recent Answer : Added by Jamila On 2022-08-14 16:36:05:
10 minutes
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Ques:- What is the least number of four digits which is divisible by 4, 6, 8 and 10 ?
Recent Answer : Added by Subhadeep Sur On 2022-05-17 08:56:52:
LCM of 4,6,8 and 10 are 120
So, the least number of four digits is 120*9=1080 ( <1000 )
Ques:- How many times in a day, the hands of a clock are straight?
A. 22
B. 24
C. 44
D. 48
Recent Answer : Added by Sanjana Balasaheb Deore On 2022-03-09 16:26:16:
22
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Ques:- A bundle of balloons contains 12 packets and there are 24 bundles in a box. The retail price of a packet of balloons is given by the user and calculate the price of such 5 boxes.
Ques:- The price of sugar increases by 20%, by what % should a housewife reduce the consumption of sugar so that expenditure on sugar can be same as before ?(a) 15%(b) 16.66%(c) 12%(d) 9%
Recent Answer : Added by Rk On 2021-08-25 14:15:42:
(b) 16.66%
Earlier for ₹x we could purchase y gm of sugar.
Now we pay ₹1.2x for y gm of sugar
(As there was an increase in price so, x + 20%x = 1.2x)
At current rates for ₹x you can purchase y/1.2 gm of sugar
So the reduced consumption is y-(y/1.2)
Percentage change = (reduced consumption/ original consumption ) *100
That is (0.2/1.2) *100 = 16.66% (approx)
Ques:- With just six weights and a balance scale, you can weigh any unit number of kgs from 1 to 364. What could be the six weights?
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Ques:- The number of prime numbers between 0 and 50 is
A. 14
B. 15
C. 16
D. 17
Recent Answer : Added by narendra On 2022-09-18 09:02:10:
b
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Ques:- In a race of 1000 m, A can beat by 100 m, in a race of 800m, B can beat C by 100m. By how many meters will A beat C in a race of 600 m?
Recent Answer : Added by Kristi Bardhan On 2022-09-02 17:04:02:
When A runs 1000 meters, B runs 900 meters and when B runs 800 meters, C runs 700 meters.
Therefore, when B runs 900 meters, the distance that C runs = (900 x 700)/800 = 6300/8 = 787.5 meters.
So, in a race of 1000 meters, A beats C by (1000 – 787.5) = 212.5 meters to C.
So, in a race of 600 meters, the number of meters by Which A beats C = (600 x 212.5)/1000 = 127.5 meters.
Ques:- By selling 12 pencils for a rupee a man loses 20%. How many for a rupee should he sell in order to gain 20%?
Ques:- A train travelled from station P to Q in 8 hours and came back from station Q to P is 6 hours. What would be the ratio of the speed of the train while traveling from station P to Q to that from station Q to P?
Recent Answer : Added by Sahil On 2021-08-03 15:59:07:
Ratio: 3/4
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All books can be arranged in 10! ways. A single pair of books can be taken as a unit and arranged among the 8 others in 9! ways. The pair of books can also be interchanged and therefore rearranged in 2! ways. Thus the probability of the pair always being together is (9!*2!)/10!