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 : [JEE Main 2024, 1 Feb (Shift 1)]

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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 \(c\) i…