4*5=20
8*(7-4)=24
20+24=44
The trick is to make the figure into two
23
Those are not the answer:
1) 20 - can be divided by 2
2) 21 - can be divided by 3
3) 22 - can be divided by 2
4) 24 - can be divided by 2 and 4.
5) 25 - can be divided by 5
6) 26 - can be divided by 2
7) 27 - can be divided by 3
8) 28 - can be divided by 2 and 4
1. 1/a^8 (Sorry I can't find out what the others are)
