Question

The 10th term from the end of an A.P. is its 11th term from the beginning and its value is 55.if the first term is 5, find the common difference, the number of terms and the last term.
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Answer 1

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Answer 2

Answer:

5+10d = 5+ (n -10)d ⇒ 10d = nd - 10d ⇒ 20d =nd n =20 5+10d = 55⇒ d = 5 tn = 5+19 x 5 =100Read more on Sarthaks.com - https://www.sarthaks.com/485523/10-th-term-from-the-end-is-its-11-th-term-from-the-beginning-its-value-is-55-if-its-first-term-be