Capgemini Company Numerical Ability Permutation and Combination

in how many ways can 5 members be selected out of 10 members,so that any two particular members must always be excluded?

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Capgemini Other Question

A and B can do a piece of work in 8 days B and C can do the same in 12 days , A and C do the same in 8 days. If A,B,C work together how many day it will complete how many rotations per minute must a wheel of diameter 1.5m make to achieve a speed of 45 kmph?