Question
A student is required to select 4 questions to attempt
from a set of 10 questions. How many different ways can the student make this selection?Solution
Required number of ways = 10C4 We know that nCr = n! ÷ [(n - r) ! X r!] = 10! ÷ [(10 - 4) ! X 4!] = 10! ÷ (6! X 4!) = 210
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