Find the probability. one digit from the number 3,151,221 is written on each of seven cards. what is the probability of drawing a card that shows 3, 1, or 5? a. 2/7 b. 5/7 c. 3/7 d. 4/7

Answer is B
5 out of the 7 cards would have a 1,3, or 5
Therefore 5/7 probability of pulling one of those cards

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post