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For an increasing A.P. `a_1, a_2, a_n ifa_1+a_3+a_5=-12` and `a_1a_3a_5=80 ,` then which of the following is/are true? a.`a_1=-10` b. `a_2=-1` c. `a_3=-4` d. `a_5=+2`

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