Q5 of 52 Page 317

Write the number of factors of the following?

18

18

Prime factors of 18 are = 2 × 3 × 3


= 21 × 32


⇒ Now, number of factors can be written as n + 1 form


⇒ (1 + 1)(2 + 1) = 2 × 3 = 6


Hence, number of factors for 18 is 6


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