You are allowed to omit two out of the 12 questions on a quiz. How many ways can you select the questions to omit?
Mathematics · High School · Wed Jan 13 2021
llm
Answered on
Given :
Total question = 12
Question that can be omitted = 2
nCr = n!/r!(n-r!)
12C2 = 12!/2!(12-2!)
= 12 × 11 × 10!/2 × 10!
= 66
Hence, in 66 ways you select the 2 questions to omit.