Campus Maths Puzzle Numerical Ability Probability

7Q. Three cards are drawn from a well shuffled pack of 52 cards. Find the probability that they are a king, a queen and a jack.

a.) 17/5525
b.) 16/5325
c.) 16/5525
d.) 16/2525

Read Solution (Total 1)

Required probability=(4C1*4C1*4C1)/52C3=64/22100=16/5525
Hence option c) is correct.
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Campus Other Question

6Q. Two pipes are used to fill the cistern completely. The second pipe opened one hour after the first pipe. Three hours after the first pipe has opened, there is still (9/20) of the cistern is to be filled. When the cistern is completely filled, it was found that each pipe has filled half of the cistern. How many hours would it take each one to completely filled the cistern individually?

a.) 10 hr & 8 hr
b.) 18 hr & 5.6 hr
c.) 15 hr & 4 hr
d.) 12 hr & 8 hr 8Q. A can hit a target 4 times in 5 shots, B can hit 3 times in 4 shots & C can hit twice in 3 shots. When they fire together, what is the probability that at-least two shots hit the target?

a.) 5/6
b.) NOT
c.) 2/30
d.) 1/3