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Instructions
What willcome in place of question mark (?) in the given number series ?
Solution
Squares of odd numbers starting from 5 are alternatively added and subtracted.
300 $$+ 5^2$$ = 325
325 $$- 7^2$$ = 276
276 $$+ 9^2$$ = 357
357 $$- 11^2$$ = 236
236 $$+ 13^2$$ = 405
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