neither 3 nor 5
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well I don't think thats what the question is..pops wrote:straightforward:
we are looking for number of numbers not divisible by 5*3 i.e. 15.
So there are 1000/15 = 66 numbers not divisible by both 5 and 3.
it is not asking for numbers not divisible by 15
it is asking for number not divisible by 3 or 5
so number of numbers divisible by 3= 333
number of numbers divisible by 5=200, this contains multiple of 15
so number of numbers divisible by 15=66
total number of numbers divisible by 3 or 5= 333+200-66
467
not divisible by 3 or 5 will be 1000-467
=533
thanks GID for pointing out the mistake. I guess I should work on my addition and subtraction:)
Last edited by tohellandback on Tue Jun 23, 2009 8:42 am, edited 1 time in total.
The powers of two are bloody impolite!!