alleryNumber of ways to choose 4 students from class of 10 if 2 specific students must be included:
A28 (= C(8, 2) — choose remaining 2 from 8)
B45
C30
DC(10,4) = 210
Answer & Solution
Correct answer: A. 28 (= C(8, 2) — choose remaining 2 from 8)
2 students fixed in, choose 2 more from remaining 8: C(8, 2) = 28.
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