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[" (a) Find the value of "x'" if "x+1,2x...

[" (a) Find the value of "x'" if "x+1,2x+1" and "x+1" are in A.P.Also find the "4" th term of "],[" progression."],[" (b) If "k+3,2k+1,k+7" are in A.P.then find this progression upto "5" terms."]

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