find the sum of 102+97+92...to 20 terms?
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Answered by
7
answer is 1090 by the formula of sum of Sn terms
Answered by
5
no of terms=20
first term=102
common difference=5
Sn=20/2×(2×102+(20-1)×5)
=10×(204+95)=2990
first term=102
common difference=5
Sn=20/2×(2×102+(20-1)×5)
=10×(204+95)=2990
fian:
sir d= -5
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