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21. svibnja 2015. 00:04 (9 godine, 6 mjeseci)
Prove that the fraction
is irreducible for every natural number
.
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Prove that the fraction $\dfrac{21n + 4}{14n + 3}$ is irreducible for every natural number $n$.
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GCD(21n+4, 14n+3) = GCD(7n+1, 14n+3) = GCD(7n+1, 7n+2) = GCD(7n+1, 1) = 1
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GCD(21n+4, 14n+3) = GCD(7n+1, 14n+3) = GCD(7n+1, 7n+2) = GCD(7n+1, 1) = 1