1280 when divided by a smallest number becomes perfect square
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prime factor of 1280 is
2×2×2×2×2×2×2×2 ×5
here,
5 is left to he paired if we removed 5 by divided it by 5 it will be a perfect square
2×2×2×2×2×2×2×2 ×5
here,
5 is left to he paired if we removed 5 by divided it by 5 it will be a perfect square
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