Answer:
9
Step-by-step explanation:
cube root the number
<span>y = 2 for x < 0
= x for 0 ≤ x < 3
= 3 for x ≥ 3 </span>
To evaluate the combination we proceed as follows:
21C3
Given nCk we shall have:
n!/[(n-k)!k!]
thus plugging the values in the expression we get:
21!/[(21-3)!3!]
=21!/(18!×3!)
=1330
Answer: 1330
