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Complete the series choosing the missing number:

121, 169, 289, 361, 529, ______


1. 625
2. 676
3. 729
4. 841

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Correct Answer - Option 4 : 841

The pattern followed here is shown below:

Here, the square of Prime numbers starting from 11 is continued.

(11)2 = 121

(13)2 = 169

(17)2 = 289

(19)2 = 361

(23)2 = 529

(29)2 = 841

Hence, "841" is the correct answer.

NOTE : Here another sequence is also observed which is of +2 and +4 so the next square term would be 252 = 625, which is also in the options but as this is a previous year paper question, the valid and acceptable answer given by the board is 841, according to the given logic of prime numbers.

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