a boy running up a stair case finds when he goes up two steps at a time there is one step over when he goes up three at a time there are two over and when he goes up four at a time, there are three over. find number of stairs which is b/w 40 & 50.(adsbygoogle = window.adsbygoogle || []).push({});

a.) 47 b.)45 c.)42 d.)49 e.) none

:rofl:

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