Train Your Brain :-

1.(NTSE Stage I): x, y and z are three sums of money such that y is the simple interest on x. z is the simple interest on y for the same value of time and same rate of interest. The relation among three sums are: (a) x 2 = yz (b) y 2 = xz (b) z 2 = xz (d) xyz = 1 2.If α and β are zeroes of x2 – 4 x + 1, then 1/α + 1/β – αβ is (a) 3 (b) 5 (c) –5 (d) –3 3.If α, β are zeroes of x 2 – 6x+ k, what is the value of k if 3α+2β=20. (a)–16 (b) 8 (c) 2 (d) –8.