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7+77+777+....+(777....n" times ")=...

7+77+777+....+(777....n" times ")=

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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) .

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

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

Find the sum of the sequence 7, 77, 777, 7777, ... to n terms.

Find the sum of the sequence 7, 77, 777, 7777, ... to n terms.

Find the sum of the sequence 7, 77, 777, 7777, ... to n terms.

Find the sum of the sequence 7, 77, 777, 7777, ... to n terms.

Find the sum of the sequence 7, 77, 777, 7777, . . . to n terms.

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