Solve previous year Question of iit jee
Chapter :- sequence and series
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Answer:
let S = 0.7 + 0.77 + 0.777 + . . . . . upto 20 term.
= 7(0.1 + 0.11 + 0.111 + . . . . . . .upto 20 term)
multiply and divide by 9 :
taking 1 common in each . ..
now, 0.1 , 0.01 ,0.001 are in gp with common ratio = 0.1
hence, correct option is (c).
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