find the number of terms in the ap 19, 141/2, 12....., -38
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this not an a.p because there is gap of -11.95 but than it is diffrence of +4.95.
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an = -38 . a= 19 d= 12- 141 / 2
an = a+ (n-1)d
-38=19+ (n-1) (-117/ 2)
????????? solve u
an = a+ (n-1)d
-38=19+ (n-1) (-117/ 2)
????????? solve u
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