461 + 462 + 463 + 464⇒ 461 + 462 + 463 + 464 = 461 (1 + 4 + 42 + 43)⇒ 461 + 462 + 463 + 464 = 461 (1 + 4 + 16 + 64)= 461 × 85Which is a multiple of 10.
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