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If 3, a, b, c are in AP and 3, a - 1, b + 1, c + 9 are in GP then AM of a, b, c is _______.

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If 3, a, b, c are in AP and 3, a - 1, b + 1, c + 9 are in GP then AM of a, b, c is _______.

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AM of a, b, c is 11.

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