How do you define a variable in a shell

864, 432, 144, ? , 7.2, 1.2

What will come in place of the question mark (?) in the following series?

22, 28, 37, ?, 72, 102

Find the missing term in the series:

4, 7, 13, 25, 49, ?

168, 178, ?, 273, 400, 618, 963

Find the missing number in the given number series.

2, 7, 19, 62, ?, 1270 

What value should come in the place of (?) in the following number series?

4913, 2197, ?, 343, 125, 27

36      37       33      42       ?       51       15

150     15      3      ?      0.36       0.18

81, 83, 87, 95, 111, ?

What will come in place of the question mark (?) in the following series?


11, 18, 32, 60, ?, 228