Question

Find the number of odd factors of 2160 (A) 4 (B) 7 (C) 10 (D) 8​

Answer 1

Answer:

B is the odd one out because 2160 can't divided by 7

Answer 2

Answer:

Factors of 2160 = 2^4 * 3^3 * 5^1

There are four 2's, three 3's, one 5.

Number of ways are (a + 1)(b + 1)2^c - 1

                                 = (4 + 1) (3 + 1)2^1 - 1

                                = (5)(4)(2) - 1

             

                                 = 40 - 1

                                 = 39.

Step-by-step explanation:

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