Let $3,a,b,c$ be in A.P. and $3,a - 1,b + 1,c + 9$ be in G.P. Then, the arithmetic mean of $a,b$ and $c$ is - Math Practice Question | divineJEE

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Let $3,a,b,c$ be in A.P. and $3,a - 1,b + 1,c + 9$ be in G.P. Then, the arithmetic mean of $a,b$ and $c$ is

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