What should come in place of '?' in the given series? 45 ? 63 81 105 135
51
Examine the gaps between the known consecutive terms.
From the third term onward: 63 to 81 is +18, 81 to 105 is +24, 105 to 135 is +30. The gaps increase by 6 each time.
So going backward, the gap before 63 should be 18−6 = 12, and the gap before that should be 12−6 = 6.
Therefore 45 + 6 = 51 (the missing term), and 51 + 12 = 63, which matches the given series.
Hence, the missing number is 51.
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Important Questions from Number Series
What will come in place of question mark (?) in the following number series?
2, 5, 11, 23, 44, 77, ?
What will come in place of question mark (?) in the following number series?
31, 32, 36, ?, 61, 86
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A series is given with one term wrong. Select that wrong term from the given alternatives.
J12, M24, P48, S96, U192
