If 9th and 23rd terms of an A.P. are respectively 50 and 92. Find 15th term of A.P.
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a+8d = 50 ------ eqn(1)
a+22d = 92 ----- eqn (2) this equation are solve to the value of a and d then this value are put in the equation a+ 14d and solve to get answer 68
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