Write the number of factors of the following?
45
45
Prime factors of 45 are = 5 × 3 × 3
= 51 × 32
⇒ Now, number of factors can be written as n + 1 form
⇒ (1 + 1)(2 + 1) = 2 × 3 = 6
Hence, number of factors for 45 is 6
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