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Home / Doubts and Solutions/JEE/Mathematics

please solve the encircled qn

qsnImg
Asked by arup.isro 20th August 2018, 11:05 PM
Answered by Expert
Answer:
0.15 + 0.015 + 0.0015 +....8 terms
a=0.15, r = 0.015/0.15 = 0.1
begin mathsize 16px style straight S subscript 8 equals 0.15 open parentheses fraction numerator 1 minus 0.1 to the power of 8 over denominator 1 minus 0.1 end fraction close parentheses straight S subscript 8 equals 0.15 open parentheses fraction numerator 1 minus 10 to the power of negative 8 end exponent over denominator 0.9 end fraction close parentheses straight S subscript 8 equals fraction numerator 0.15 over denominator 0.9 cross times 10 to the power of 8 end fraction open parentheses 10 to the power of 8 minus 1 close parentheses straight S subscript 8 equals fraction numerator 15 over denominator 90 cross times 10 to the power of 8 end fraction open parentheses 10 to the power of 8 minus 1 close parentheses straight S subscript 8 equals fraction numerator 1 over denominator 6 cross times 10 to the power of 8 end fraction open parentheses 10 to the power of 8 minus 1 close parentheses end style
Answered by Expert 21st August 2018, 11:14 AM
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