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What should come in place of question mark (?) in the following question?  √1296 + ∛216 = √441 + ?

What should come in place of question mark (?) in the following question?  √1296 + ∛216 = √441 + ? Correct Answer 21

Given :- 

√1296 + ∛216 = √441 + ?

Calculation :-

⇒ √1296 = 36

⇒ ∛216 = 6 

⇒ √441 = 21 

⇒ 36 + 6 = 21 + ? 

⇒ 42 = 21 + ? 

⇒ ? = 42 - 21 

⇒ ? = 21

∴ ? is 21

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