Instructions

What willcome in place of question mark (?) in the given number series ?

Question 110

300, 325, 276, 357, 236, ?

Solution

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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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