worksheet Arithmetic progressions€¦ · 15 Find the 78th term of an arithmetic progression if the 41st term is 25 and the 51st term is 25. 16 Find the 19th term of an arithmetic
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RuleIn an arithmetic progression, the nth term tn can be found bytn 5 a 1 (n 2 1)dwhere a is the first term and d is the common difference.The common difference d can be found byd 5 tn 2 tn 2 1