37 ? 103 169 257 367

19 26 40 68 124 (?) Find the nex number in the series.

In which category was the percentage of spam emails increasing but at a decreasing rate?

23 10 40 172 885 5346

3 ? 14 55 274 1643

Let x1, x², ..., be positive integers in A.P. such that x₁ + x₂ + x₃ = 12 and x₄ + x₆ = 14. Then x5 is

If (x + z) (x – 2y + z) = (x – z)², where x, y and z are all real and distinct, then

(51 + 52 + 53 + ……… + 100) is equal to:

Complete the series 25, 125, 36, 216, 49, ___

61 72 ? 73 59 74 58