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The 5th term of an ap is 1 whereas if 31st term is -77 which term of the ap is -17 ?
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Answer:
a+4d = 1 --- 1
a+30d = -77 ---- 2
subtract them we get 26d = -78
d = -3 a = 1+12 =13
-17 = 13 +(n-1) *-3
10= n-1
n = 11
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