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The sum of first 9 terms of an arithmeti...

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 `10^(th)` to `18^(th)` terms?
b) What is its `5^(th)` term?
c) Find its `14^(th) ` term.
d). Find the sum of `5^(th)` to `14^(th)` terms.

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