1, 5, 14, 30, 55, 91, ?

130

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140

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150

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160

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Solution

The correct option is A 140
The pattern is + 4, + 9, + 16, + 25, + 36, ..... i.e. + $2^{2}, + 3^{2}, + 4^{2}, + 5^{2}, + 6^{2}, . . . . .$
So, missing term = $91 + 7^{2} = 91 + 49 = 140$ .

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1, 5, 14, 30, 55, 91, ?

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