Question

.Find the sum of the following (1)+(1+1)+(1+1+1)+......+(1+1+1+.... n - 1 times)

Answer 1

Step-by-step explanation:

(1)+(1+1)+(1+1+1)+......+(1+1+1+.... n - 1 times)

1+2+3+4+........ +n-1

(n-1)(n-1+1)/2

(n-1)(n)/2