i cant believe i cant do this . dd2 has a maths challenge to use 4 numbers between 1 and 8 and to get them to add up to 20 using each number once only. homework guide states that there are 7 .dd2 can only find 6 and so can i !! tis now driving me mad so any help appreciated ..so far we have:
8+7+3+2
8+7+4+1
8+6+5+1
8+6+4+2
7+6+2+5
7+6+3+4
showing myself to be a complete numpty but 