Find the sum of 50 terms of the series 7 + 7.7 + 7.7 + 7.777 +
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Answer:
a=7
d=a2-a1
=7.7-7
=0.7
n=50
sum=n/2(2a+(n-1)d)
=50/2(2*7+(50-1)0.7)
=25(14+49*0.7)
=25(14+34.3)
=25(48.3)
=1207.5
sum of first 50 terms is 1207.5
hope it helps
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