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In which of the following expressions, prime factorisation has been done?(a) 24 = 2 × 3 × 4(b) 56 = 7 × 2 × 2 × 2(c) 70 = 2 × 5 × 7(d) 54 = 2 × 3 × 9 |
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Answer» (a) 24 = 2 × 3 × 4 Since 4 is composite, prime factorisation has not been done. (b) 56 = 7 × 2 × 2 × 2 Since ail the factors are prime, prime factorisation has been done. (c) 70 = 2 × 5 × 7 Since all the factors are prime, prime factorisation has been done. (d) 54 = 2 × 3 × 9 Since 9 is composite, prime factorisation has not been done. |
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