if nth term of an AP is 7-4n. Find the sum of first 5 terms
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if nth term=7-4n
then,
5th term=7-4×5=7-20= -13
1st term=7-4=3
so, sum of first 5 terms=5/2(3-13)
=5/2(-10)
=5×(-5)
=-25
Hence, answer will be-25
then,
5th term=7-4×5=7-20= -13
1st term=7-4=3
so, sum of first 5 terms=5/2(3-13)
=5/2(-10)
=5×(-5)
=-25
Hence, answer will be-25
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