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[" If "7+77+777+..." upto "n^(" th ")" t...

[" If "7+77+777+..." upto "n^(" th ")" term "],[[=(7)/(81)[a.10^(n+1)-bn-c]" is true "AA n in N," then "],[" (1) "a=1,b=9,c=9],[" (2) "a=1,b=9,c=10],[" (3) "a=1,b=-9,c=-9],[" (4) "a=1,b=-9,c=-10]]

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