Question

Below is a multiplication table up to y*y. Find y such that the sum of all the products in the table equals 44488900?

Answer 1

[(1+y)y/2]^2=44488900

[(1+y)y/2]=(+/-) 6670
y^2+y (-/+) 13340 =0

y^2+y (-/+) 13340 =0

The positive value refused not to get y complex

y^2+y -13340 =0

.
y=115, y=-116 (refused)

y=115