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which number is a prime number ? a27 b25 c49 d53
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d) 53
Explanation: 27 = 3×3×3, 25 = 5×5, 49 = 7×7, while 53 has no divisors 2,3,5,7 (primes ≤ √53 ≈ 7.28), so 53 is prime.
Explanation: 27 = 3×3×3, 25 = 5×5, 49 = 7×7, while 53 has no divisors 2,3,5,7 (primes ≤ √53 ≈ 7.28), so 53 is prime.
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