17
There are 3 cards in Box A and 3 cards in Box B.
There is a number on each card.
a
Box B
Box A
9
3
4
4
2
2
3
5
a
Ryan takes at random a card from Box A and a card from Box B.
He adds together the numbers on the two cards to get a total score.
Work out the probability that the total score is an odd number.