Problems based on Numbers Test 4

Question : 36 of 40

Marks: +1, -0

Find the total number of different factors of 72 excluding 1 and 72.

Solution:

72 = 2^3 × 3^2

Factors = (3 + 1) (2 + 1) = 4 × 3 = 12 (including 1 and 72)
12 - 2 = 10 (Excluding 1 and 72).

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