Select the number from among the given options that can replace the question mark (?) in the following series. 121, 131, 151, 181, 221, ?

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Answer & Explanation

Correct AnswerB. 271

Quick Explanation

The differences are +10, +20, +30, +40. The next difference is +50, so 221 + 50 = 271.

Next term = previous term + next difference

The differences are +10, +20, +30, +40. The next difference is +50, so 221 + 50 = 271.

Look for increasing differences.

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