Quantitative Aptitude: Permutations and Combinations Set 2

A student is to answer 10 out of 15 questions in an examination such that he must choose at least 5 from the first six questions. The number of choices available to him is 820 910 745 882 None Option D Solution: No of choices=6c5.9c5 +6c6.9c4 =6*[(9*8*7*6)/(4*3*2*1)] + 1*[(9*8*7*6)/(4*3*2*1)] =6*126 +1*126 =756+126 =882. The number of ways in which a…

Read More

Quantitative Aptitude: Permutations and Combinations Set 1 (From Basics)

Quant Questions Bank PO

This time in SBI PO Mains 2017 along with probability, a simple question from Permutations and Combinations was also asked. Permutations and Combinations Basic Questions for NICL AO, IBPS RRB PO/Clerk, IBPS PO/Clerk, and other exams. There are 36 boys and 28 girls in a class. For inter-school competition, 1 boy and 1 girl is to be selected. In how many…

Read More