Question

7. The sum of first 9 terms of an arithmetic sequence
is 45 and the sum of first 18 terms is 171.
(a) What is the sum of its 10th to 18th terms?
(6) What is its 5th form?
(C) Find its 14th term.
(d) Find the sum of 5th to 14th terms​

Answer 1

Answer:

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