Question

To win $1 million, you must draw two cards whose sum is nine, from a stack of cards numbered 1 through 10. After the first draw, you replace the card and shuffle the stack again for the second draw. What is the chance that your two cards will have a sum of nine?

Answer 1

There are 10x10 or 100 ways to draw the two cards

Of those the following add up to 9
1 8, 2 7, 3 6, 4 5, 5 4, 6 3, 7 2, and 8 1

so the prob of drawing 2 cards that add up to 9 is
8/100 = 2/25

Where can I play this game ?????

Answer 2

2+7=9 7+2=9 1+8=9 8+1=9 3+5+1=9 5+1+3=9