Understanding How Many Times Nested Loops Will Run

Question

I am trying to understand how many times the statement \"x = x + 1\" is executed in the code below, as a function of \"n\":

for (i=1; i<=n; i++)
  for (j=1; j         


        

Answer 1

1 + (1+2) + (1+ 2+ 3 ) +......+ (1+2+3+...n)