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# The only prime factors of a number n are 2, 5, 7, and 17. Which of the following could NOT be a factor of n?

A)10

B)20

C)25

D)30

E)34

### 4 Answers

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- Wayne DeguManLv 76 months agoFavourite answer
10 = 2 x 5

20 = 2² x 5

25 = 5²

30 = 2 x 3 x 5

34 = 2 x 17

n is not divisible by 30 as it would have to be divisible by 3 also.

:)>

- ignoramusLv 76 months ago
You are not very bright, are you ? Don't you have a calculator ? Just TRY them, for god's sake.

2 x 5 x 7 x 17 = 1190

Now try dividing 1190 by each of the given numbers. (Hint : there are THREE answers.)

- ?Lv 76 months ago
The only prime factors of a number n are 2, 5, 7, and 17.

Which of the following could NOT be a factor of n?

Answer choice:

D) 30

- Anonymous6 months ago
D because 3 would also be a prime factor

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