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multiples

by artstudent » Wed Jul 20, 2011 9:00 pm
How many factor of 700 is greater than 77?

Is there a quick way to do this? (I broke down the factors and (2)^2(5)^2(7) and multiply to find out. This took too long)
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by krishnasty » Wed Jul 20, 2011 9:13 pm
Even i broke it down as
2*2*5*5*7

possible combinations:
5*2*2*7
5*2*7
5*5*2*2
5*5*2*7
5*5*7
5*5*2*2*7

i guess the possible combinations come out to be 6.

Wats the OA?
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by winniethepooh » Wed Jul 20, 2011 9:16 pm
This is the only best way & this is the best way..would take you less than half a minute.

Simply divide 700 by its prime factors
Or
even simpler do this:
700 = 70*10 = 7*10*10 = 7*2*5*2*5 = 2^2 * 5^2 * 7!
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by artstudent » Wed Jul 20, 2011 9:16 pm
you are right but is there a faster way? i pretty much did the same way
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