Find the sum of first 20 terms of the series 7 + 7.7 + 7.77 +....
Answers
Answered by
0
Step-by-step explanation:
= 7+7.7+7.77+...
=7(1+1.1+1.11+..)
first term = 1 =a
2nd term = 1+(1/10)¹
3rd term = 2nd term + (1/10)²
sum of first term =1
sum of 2nd term = 2.1
sum of 3 terms = 3.21
sum of 4 terms = 4.321
sum of 20 terms =
22.0987654320987654321 ×7
=154.7
Similar questions