Instructions

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

Question 131

121, 117, 108, 92, 67, ?

Solution

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121 - $$2^2$$ = 117

117 - $$3^2$$ = 108

108 - $$4^2$$ = 92

92 - $$5^2$$ = 67

67 - $$6^2$$ = 31

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