A teacher of 6 students takes 2 of his students at a time to a zoo as often as he can, without taking the same pair of children together more than once. How many times does the teacher go to the zoo?
A. 10
B. 12
C. 15
D. 20
Answer: Option C
Solution(By Examveda Team)
Two students can be selected from 6 in 6C2 =15 ways. Therefore, the teacher goes to the zoo 15 times.This Question Belongs to Arithmetic Ability >> Permutation And Combination
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Tere should be subtraction of 1 as no same 2 child are going together