If S1 and S2 be the whole surface of a sphere and the curved surface of the circumscribed cylinder, then S1 is equal to
a)S2, b)2S2 c)(1/2)S2 d)(2/3)S2
Two candles have different lengths and thickness. The shorter lasts 11 hours and the longer 7 hours,when both are lit simultaneously. If after 3 hours of their being lit together at the same time, both have the same length, then what is the ratio of their original lengths?
The length of the sides of the right angled triangle are given in natural numbers.If two of these numbers are odd and they differ by 50, then least possible value of third side is
a)61 b)60 c)51 d)50
There are four bus routes from A to B and three bus routes between B and C.A man can travel a round trip in number of ways from A to C via B.If he doesn't want to use a bus route more than once, in how many ways he can make a round trip ?