Number Series & Coding Mock Tests

Find the wrong number in the series: 3, 7, 15, 31, 63, 129

In a certain code language, "COMPUTER" is written as "DPNQVUFS". How will "KEYBOARD" be written in the same code?

The next number in the series 2, 6, 12, 20, 30, ... is:

Find the missing number in the series: 3, 9, 27, 81, ?

What should come in place of the question mark in the following number series? 3, 12, 27, 48, ?, 108

In a certain code language, "COMPUTER" is written as "DPNQVUFS". How is "KEYBOARD" written in that code?

2, 6, 12, 20, 30, ? What comes next?

What comes next in the series: 2, 6, 12, 20, 30, ?