please help me find the logic ..

[/INDENT][/INDENT]Find the missing number ?

15 ?

3 80
63 24
8 48


a)14 b)20 c)35 d)42 e)70

Thanks in advance all....(Doh)

Quote:

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Originally Posted by edendeli

[/INDENT][/INDENT]Find the missing number ?

15 ?

3 80
63 24
8 48


a)14 b)20 c)35 d)42 e)70

Thanks in advance all....(Doh)

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Well I don't see a pattern for each particular pair, but I notice all the numbers are perfect squares minus 1, so based on that I would go with (c).

Edit: Oh didn't see the image, so they're not in pairs after all. Yeah, (c).

omg yea ... thats great ... thank you so much :)