Find the sum of sequence, 7, 77, 777, 7777..... to n terms ???
plz ans fast....
its very urgent
@ Shubhangi Chakr , Good answer except last step while multiplying will give you,
70/81(10n-1) - 7n/9 ANSWER
Keep posting !!
70/81(10n-1) - 7n/9 ANSWER
Keep posting !!