1 through 2*70 - 1 or 139 figure that out by experiment
average = (1+139)/2 = 70
70 * 70 = 4900
What is the sum of the first 70 consecutive odd numbers?
2 answers
By the way
what we really did was :
n[(n*2-1)+1 ]/2
which is n^2
or 70^2
what we really did was :
n[(n*2-1)+1 ]/2
which is n^2
or 70^2
1 answer