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Suppose a1, a2, 2, a3,a4 be in an arithm...

Suppose `a_1, a_2, 2, a_3,a_4` be in an arithmeticogeometric progression. If the common ratio of the corresponding geometric progression is 2 and the sum of all 5 terms of the arithmetico geometric progression is `49/2` , then `a_4` is equal to____.

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