Others Maths Puzzle Numerical Ability Permutation and Combination

Q. The crew of an 8 member rowing team is to be chosen from 12 men, of which 3 can row on one side only and 2 can row on other side only. Find the number of ways of arranging the crew with 4 members on each side.

Option
A)40320
B)30240
C)60480
D)10080

Read Solution (Total 2)

Looking at options, it seems the 5 people who can steer in one particular direction only are taken in the team directly, remaining 3 members are to be chosen from a team of 7, and arranged.

Hence, 5c5*7c3*4p2*4p3*3!

Choose, 3 people from 7, then first make those people sit who can steer in particular directions. Hence, 4p2(for 2ppl who steer left side), then 4p3 (steer right) and remaining are for the normal persons (3!)

Answer: 5c5*7c3*4p2*4p3*3! = 60480
9 years agoHelpfull: Yes(3) No(0)

7c3*3c1*4!*4!=60480
11 years agoHelpfull: Yes(0) No(2)

Others Other Question

Q. If one pipe is added for set X and Y and set Z's capacity is increased by 20% on its original value and all the taps are opened at 2.58pm, then at what time does the tank get filled?(If it is initially empty)

Option
A)3.05 pm
b)3.04 pm
C)3.10 pm
D)3.03 pm Q. A tea party is arranged for 2M people along two sides of along table with M chairs on each side. R men wish to sit on one particular side and S on the other. IN how many ways can they be seated.(provided R,S)