by\:mathematical\:induction\:show\:that\:the\:following\:is\:true\:for\:nEz\:7+77+777............7n\:times=\frac{77}{81}\left(10^{n+1}-9n-10\right)
Mathbot Says...
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.