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प्रश्न
Using prime factorization method, find which of the following numbers are perfect square?
441
उत्तर
441 = 3 x 3 x 7 x 7
Grouping them into pairs of equal factors:
441 = (3 x 3) x (7 x 7)
There are no left out of pairs. Hence, 441 is a perfect square.
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