The wrong number in the series 2, 9, 28, 65, 126, 216, 344 is
The wrong number in the series 2, 9, 28, 65, 126, 216, 344 is
1). 65
2). 216
3). 9
4). None of these
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This question was asked some where in previous year papers of ssc, and correct answer was 216
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Answered by
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The pattern is :
$1^{3}$ + 1 = 1 + 1 = 2
$2^{3}$ + 1 = 8 + 1 = 9
$3^{3}$+ 1 = 27 + 1 = 28
$4^{3}$ + 1 = 64 + 1 = 65
$5^{3}$ + 1 = 125 + 1 = 126
$6^{3}$ + 1 = 216
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