Length: 12
Width: 4 since 12x4=48 and length is 3 times as long as it is wide.
<span>60 x 40 = 2400 8 x 40 = 320 60 x 3 = 180 8 x 3 = 24 68 x 43 = 2924</span>
For every
, we have

So, negletting the first term, each term of the sum is greater than 1, which implies

Which means that the series diverges.