Question
221, 100, 0, -81,
? What should come in place of question mark (?) in the following number series?Solution
221 221 - 11² = 221 – 121 = 100 100 - 10² = 100 – 100 = 0 0 - 9² = – 81 -81 - 8² = 81 – 64 = - 145
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