If the second term of ap is 8 and 5th term is 17. find its 19th term.
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Case 1,A+(2-1)d=8A+d=8……..(1)Case 2,A+(5-1)d=17A+4d=17…….. (2)By subtracting eq(1)from eq (2) we get,D=3Putting value in eq1or2we get,A=5n19th term =a+(19-1)d =5+(18×3) =5+54 =59 àńś’}