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How many positive factors does 720 have?

Competition practiceNumber & Arithmetic

A30
B24
C28
D36

Step-by-Step Solution

720 =

2^{4} \times 3^{2} \times 5^{1}

. The number of factors is

(4 + 1) (2 + 1) (1 + 1) = 5 \times 3 \times 2 = 30

.

Answer: A) 30

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