Who is the Chairman of NITI Aayog

Select the number from among the given options that can replace the question mark (?) in the following series.

2, 6, 12, 20, ?, ?

92,   51,   21,   13.5,    x,   4.25

find the value of (10x + x -5)?

504 625 769 938 1134 ?

5 4 29 24 185 ?

102, 246, 442, 698, 1022, ?

Find the odd one out: 11, 13, 17, 19, 21

Find sum of first n terms: 2 + 6 + 12 + 20 + 30 + …

D irection: Which of the following will replace ‘?’ in the following series

10,14,’?’,199, 352, 530

If 2.5 3.5 x 30 124 625

Then, x ² - 1 - 2x = ?

6    16   ?      244   1,245   7,506   52,591