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
More Probability Questions
4, 6, 12, 30, ?, 315, 1260Â
Find the missing term in the series:
1, 4, 9, 16, 25, ?, 49
36, 48, 24, 60, ?, 72
?, 15, 45, 225, 1575, 14175
What should come in place of (?) question mark in the given number series.
2, 6, 15, 31, 56, ?
10,14,26,42,70,?
53 × 38 + 32 × âˆ›54872 = ?
168, 164, 155, 139, ?, 78
18, 30, 46, 66, 90, ?
152    142    122   ?     52    2
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