Can you please add a picture
Midpoint
because its in-between two points
2 * 2 * 2 * 7 = 56
or
2^3 * 7=56
Hope this helped!
A--> (a,4),(a,5),(a,6),(b,4),(b,5),(b,6)
b--> since there are 6 possible outcomes you will have 1/3 of a chance of picking a 6 or a b.
You would be able to make 90 more envelopes