Question 10

Select the number that can replace the question mark (?) in the following series.
1, 5, 9, ?, 21

Solution

The numbers represent the position in the alphabet of the letters a, e, i, and o which are the first four vowels. The next number in the sequence is therefore 21 which represents the letter u.
$$\therefore$$ The correct answer is option D.

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Select the number that can replace the question mark (?) in the following series.1, 5, 9, ?, 21

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Select the number that can replace the question mark (?) in the following series.
1, 5, 9, ?, 21