Find using principle of mathematical induction (7+77+777+...................+77777)
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By Tn=a+(n-1)d You will get your answer easily
Answered by
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hey.........
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tr = 7. ( 1 + 10 + 10^2 + ...........+ 10^r - 1 ) = 7 ( 10^r- 1) / 9
S = 7 / 9 sigma 10^r - n / 9
S = 70 ( 10^n - 1 ) / 81 - 9n / 81
S = 7 ( 10^n+1 - 9n - 10 ) / 81.
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i hope this helps u.
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mark me brainliest plz plz
.
.
tr = 7. ( 1 + 10 + 10^2 + ...........+ 10^r - 1 ) = 7 ( 10^r- 1) / 9
S = 7 / 9 sigma 10^r - n / 9
S = 70 ( 10^n - 1 ) / 81 - 9n / 81
S = 7 ( 10^n+1 - 9n - 10 ) / 81.
.
.
.
i hope this helps u.
.
.
mark me brainliest plz plz
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