Bag 'A' contains 5 white and 2 black balls. Bag 'B' contains 2 white and 3 black balls. If any one bag is chosen and a ball is taken out of it at random, what is the probability that the ball is black?

If x + y + z = 30, x² + Y² + z² = 460 and x z = y², then find the value of x z?

(123×123×123 + 130×130×130)/(123×123 - 123×130 + 130×130) = ?

If a + b + c + d = 4,  then the value of  

Which of the following statements is correct?

I. If x = 12, y = –2 and z = –10, then x³ + y³

+ z³ = 360

Find ‘x’ if (x³+3x)/(3x²+1) = 189/61

x = 7 - 4√3 then the value of x³+1/x³ is equal to?

Rs. 25200 is invested in 3 parts in such a way that Simple Interest on 1^st Part at 4% per annum for 3 years, Simple Interest on 2^nd

if a² + b² + c² = 2(4a -5b -9c)-122 , then a-b-c = ?

If x³ + y³ = 9 and x + y=3 then the value of x⁴ + y⁴ is: