In an AP the sum of first n term is( 3n)*2/2+5n/2. Find its 25th term
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Answer: Its very simple!
Find Sum of 25 terms by replacing n with 25. Then, find sum of 24 terms by replacing n with 24.
Finally, subtract Sum of 24 terms from sum of 25 terms.
The solution is the twenty-fifth term, itself.
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