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प्रश्न
Using prime factorization method, find which of the following numbers are perfect square?
225
उत्तर
225 = 3 x 3 x 5 x 5
Grouping them into pairs of equal factors:
225 = (3 x 3) x (5 x 5)
There are no left out of pairs. Hence, 225 is a perfect square.
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