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AMC 12 2023b Problem 24

  • Paper

Suppose that aa, bb, cc and dd are positive integers satisfying all of the following relations.

abcd=26⋅39⋅57abcd=2^6\cdot 3^9\cdot 5^7 lcm(a,b)=23⋅32⋅53\text{lcm}(a,b)=2^3\cdot 3^2\cdot 5^3 lcm(a,c)=23⋅33⋅53\text{lcm}(a,c)=2^3\cdot 3^3\cdot 5^3 lcm(a,d)=23⋅33⋅53\text{lcm}(a,d)=2^3\cdot 3^3\cdot 5^3 lcm(b,c)=21⋅33⋅52\text{lcm}(b,c)=2^1\cdot 3^3\cdot 5^2 lcm(b,d)=22⋅33⋅52\text{lcm}(b,d)=2^2\cdot 3^3\cdot 5^2 lcm(c,d)=22⋅33⋅52\text{lcm}(c,d)=2^2\cdot 3^3\cdot 5^2

What is gcd(a,b,c,d)\text{gcd}(a,b,c,d)?

\textbf{(A)}~30 \textbf{(B)}~45 \textbf{(C)}~3 \textbf{(D)}~15 \textbf{(E)}~6

Dataset text AMC 12 2000 to 2025. Quoted with source.

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C

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