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161.
23x7= 161
A composite number cannot be made into a prime number. The prime factorization of 56 is 2x2x2x7 or 23x7.
42=2x3x7 56=23x7 so the HCF = 2x7 = 14
The prime factors of 56 are 2 and 7 are 2×2×2×7, or 2^3×7.