In a group of 15 women, 7 have nose studs, 8 have ear rings and 3 have neither. How many of these have both nose studs and ear rings? 

Find the value of $$ {5^{1\over2}-[3^{1\over4}+6-4÷2]}$$

On simplification of   $$ {(2.664)^2-(2.356)^2\over0.288}$$

The least number, by which 1944 must be multiplied so as to make the result a perfect cube is 

By what least number should 4320 be multiplied so as to obtain a number which is perfect cube? 

Simplify : $$ {(2x)^{2}-(2y)^{2}-(4x)^{2}}$$

The smallest number that must be subtracted from 1000 to make the resulting number a perfect square is 

Given that ( 1² +2²+3²+………..+10²)=385, the value of (2²+4²+6²+……20²) is equal to