Answer:
<em>2/9</em>
Step-by-step explanation:
The original group of cards consisted of: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
He took a 5.
The current group of cards consists of: 1, 2, 3, 4, 6, 7, 8, 9, 10
Which cards can he take and have a sum less than 8?
5 + 1 = 6 good
5 + 2 = 7 good
5 + 3 = 8 not good
Only the cards with 1 or 2 are good.
There are 9 cards remaining, and he gets the desired outcome from only 2 of those cards.
p(sum less than 8) = 2/9