22. Find the missing number in the following series.

28, 33, 31, 36, ?, 39

24. Find the missing number in the following series.

4, 16, 8, 64, ?, 256

- Option : A
- Explanation : The second number is the square of the first number; the fourth number is the square of the third number. Similarly, the sixth number should be the square of fifth. Hence, the answer is 16, i.e., square root of 256.

25. Find the missing number in the following series.

2/3, 4/7, ?, 11/21, 16/31

- Option : D
- Explanation : The numerator increases by addition of 2, 3, 4 and 5.

The denominator increases by addition of 4, 6, 8 and 10.

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