prove that `7 + 77 + 777 +...... + 777........._(n-digits) 7 = 7/81 (10^(n+1) - 9n - 10)` for all `n in N`

Prove the following by the principle of mathematical induction: 7+77+777+.....+777++\ ddotn-d igi t s7=7/(81)(10^(n+1)-9n-10) for all n in N Bdot

Prove the following by the principle of mathematical induction: 7+77+777++777++ddot n-digits7=(7)/(81)(10^(n+1)-9n-10) for all n in NB.

Prove the following by the principle of mathematical induction: 7+77+777++777++\ ddotn-d igi t s7=7/(81)(10^(n+1)-9n-10) for all n in N

Prove the following by the principle of mathematical induction: 7+77+777++777++\ ddotn-d igi t s7=7/(81)(10^(n+1)-9n-10) for all n in N

7 + 77 + 777 + …. N terms =

Evaluate 7+ 77+777+...... upto n

By using the Principle of Mathematical Induction, prove the following for all n in N : 7+77+777 +........ to n terms = 7/81 (10^(n+1)-9n-10) .

Sum to n term .7+.77+.777.......

Evaluate 7+77+777+...... upto n

Using mathematical induction show 7+77+777+......+n terms = 7/81(10^(n+1)-9n-10)