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Find the number of factors of 180?

A10

B12

C15

D18

Answer:

D. 18

Read Explanation:

2^2 x 3^2 x 5 (2+1)x(2+1)x(1+1) =3x3x2 =18


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n(n1)Pr1=?n(n-1)P_{r-1}=?

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