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321 + 323 + 325 is divisible by:

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321 + 323 + 325 is divisible by:
1. 7
2. 5
3. 4
4. 12
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Correct Answer - Option 1 : 7

GIVEN:

N = 321 + 323 + 325

CALCULATION:

321 + 323 + 325

⇒ 321(1 + 32 + 34)

⇒ 321(1 + 9 + 81)

⇒ 321(91)

⇒ 321 × 13 × 7

∴ 321 + 323 + 325 is divisible by 7. 

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