Question
117, 117, 121, 129, 141,
? What will come in place of the question mark (?) in the following series?Solution
ATQ, 117 + 0 = 117 117 + 4 = 121 121 + 8 = 129 129 + 12 = 141 141 + 16 = 157
If x + 1/x = 2, find x⁷ + 1/x⁷.
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