Find the sum of first 20 terms of the series 7 + 7.7 + 7.77 +....
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Answered by
0
Answer:
a=7
d=7.7-7=0.7
an=?
n=20
an=a+(n-1) d
an=7+(20-1) 0.7
an=7+19*0.7
an=7+13.3
an=20.3
sum=n/2(a+l)
=20/2(7+20.3)
=10*27.3
=273
Hence the sum is 273
Answered by
1
Answer:
273
is the answer
I hope it help you
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