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If r is divisible by 10 and s is divisible by 9, rs must have at least

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Re: If r is divisible by 10 and s is divisible by 9, rs must have at least [#permalink]
Bunuel wrote:
If r is divisible by 10 and s is divisible by 9, rs must have at least how many factors?

(A) Two
(B) Four
(C) Twelve
(D) Fourteen
(E) Sixteen

r is divisible by 10

s is divisible by

rs could be 90 or its multiples.

let's factorize 90 = 5*2*3*3 = 3^2 * 5 * 2

Total number of factors: (2+1) (1+1) ( 1+1) = 12

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If r is divisible by 10 and s is divisible by 9, rs must have at least [#permalink]
What if we pick 0 as the first example, wouldn't the answer be 2? I mean isn't 0 divisible by any number except itself?
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Re: If r is divisible by 10 and s is divisible by 9, rs must have at least [#permalink]
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Re: If r is divisible by 10 and s is divisible by 9, rs must have at least [#permalink]
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