Question

What should come in place of question mark (?) in the following number series?

221, 100, 0, -81, ?

A -187 Correct Answer Incorrect Answer
B - 133 Correct Answer Incorrect Answer
C - 177 Correct Answer Incorrect Answer
D - 145 Correct Answer Incorrect Answer
E - 165 Correct Answer Incorrect Answer

Solution

221 221 - 11² = 221 – 121 = 100 100 - 10² = 100 – 100 = 0 0 - 9² = – 81 -81 - 8² = 81 – 64 = - 145

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