Answer:
(a)

(b)

Step-by-step explanation:
Quotient of factorials:
we are given

we can multiply top and bottom term by 21!

we can write as

As a permutation:
we know permutation formula

now, we can compare and find 'n' and 'r'


we can plug back n=25


so, we can write

Answer:
C. C is the only one that is rational out of all of them. The rest are irrational
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C. 60 square feet I think or 72
Brainliest please I’m tryna rank up
Can you restate the question so that I know what you are asking?:)