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Re: If a and b are positive integers, what is the units digit of [#permalink]

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28 Jul 2015, 14:01

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If a and b are positive integers, what is the units digit of [#permalink]

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03 Aug 2015, 10:14

Expert's post

kakshay108@gmail.com wrote:

Hi Bunuel,

I think it should be A as the question stem states that a & b are positive integers, ruling out the possibility of b being 0.

Your comments please

Not really. Positive integers can also include numbers such as 10, 20, 35 , 77 or even 1000. Having a ,b POSITIVE INTEGERS only means that the selected integers are >0 NOT that their unit's digit is 0 (this may or may not be true as shown below).

Per statement 1, b = 1.25 a

This statement can not be sufficient as you do not know about a.

Take 2 cases:

a= 4, b = 5, units digit = 5

a =16, b = 20, unit's digit = 0 . Hence you get 2 different answers. Thus this statement is not sufficient. _________________

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