The 20th term of an arithmetic sequence is 64 and the 21th term is 70
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The nth term of an arithmetic progression whose first term is a1. and whose common difference is d is given by a. n= a1+ (n – 1) d. So, having said that, here n=20, a1=3 and d=20. 20th term = 3+(20–1)*20.
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