Prove by PMI: 7+77+777+......+77......7(n digits)=7/81(10^(n+1) -9n-10)

Asked by  | 31st Jul, 2009, 09:42: PM

Expert Answer:

Answered by  | 7th Aug, 2009, 02:22: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.