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

Find the sumiof 50 terms of a sequence 7,7.7,7.77,7.777 .

Find the sum of 50 terms of the sequence: 7,7.7,7.77,7.777……..,

Find the sum of n terms of the series " 7 + 77 + 777 + …

Find the sum of the series 3 + 7 + 13 + 21 + 31 + … to n terms . Find the sun when n=20

Find the sum to n terms of the sequence,8,88,888,8888...

Find the sum of the series : (i) 8+88+888+ ... to n terms (ii) 3+33+333+ ... to n terms (iii) 0.7+0.77+0.777+ ... to n terms

7, 77, 77, 777 div 77 equals