Which shortcut key is used to close a document in MS

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