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Instructions
What will come in place of the question mark (?) in the following number series ?
Solution
Let the missing number be y
960 - 839 = 121 = $$(11)^2$$
839 - 758 = 81 = $$(9)^2$$
758 - 709 = 49 = $$(7)^2$$
here we can see the pattern of squares of decreasing odd numbers as the difference of two consecutive numbers . So,
709 - y = $$(5)^2$$ = 25
y = 684
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