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213 + 214 + 215 + 216 + 217 is a multiple of ?


1. 15
2. 31
3. 7
4. 19

1 Answer

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Correct Answer - Option 2 : 31

Calculations:

⇒ 213 + 214 + 215 + 216 + 217

⇒ 213 (1+ 21 + 22 + 23 + 24)

⇒ 213 (1 + 2 + 4 + 8 + 16)

⇒ 213 × (31)

 213 + 214 + 215 + 216 + 217 is a multiple of 31.

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