1 2 3 4 0 6 7 8 9
Odd :- 1 + 3 +7 + 9 = 20 Even :- 2 + 4 + 6 +8 = 20
In the following sum the digits 0 to 9 have all been used, O = Odd, E = Even, zero is even and the top row's digits add to 9. Can you determine each digit?
Two digits are selected at random from digits 1 through 9. If sum is even, find the probability that both numbers are odd?