which term of ap -7,-12 ,-17 …. will be -82
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a(n) = a + (n-1)d
-7 + (n-1)(-5) = -82
(n-1)(-5) = -75
(n-1) = -75/-5 = 15
n = 15 + 1 = 16.
-82 is 16th term of AP
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