if the 17th term of an arithmetic sequence is 23 and 23rd term is 17. Find the first term and common difference
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Answer:
Step-by-step explanation:
nth term=a+(n-1)*d
17th term=23
a+(17-1)*d=23
a+16d=23----(1)
23rd term=17
a+(23-1)d=17
a+22d=17---(2)
(1) and (2) solve
6d=-6
d=-1
a=39
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