Correct question:
A deck of cards contains RED cards numbered 1,2,3, BLUE cards numbered 1,2,3,4, and GREEN cards numbered 1,2. If a single card is picked at random, what is the probability that the card is BLUE OR has an ODD number?
Answer: 2/13
Explanation:
Number of red cards = 3 (1,2,3)
Number of blue cards = 4 (1, 2, 3, 4)
Number of green cards = 2 (1,2)
Total number of cards in a deck = 52
Probability of picking a blue card OR has an odd number
P(picking a blue card ) = required outcome / possible outcome
P( picking a blue card ) = 4/52 = 1/13
P( odd number card ) = 6/52 = 3/26
P(blue and odd) = 2/52 = 1/26
P(picking a blue card or an odd number )
P(picking a blue ) U P(picking an odd number)
P(picking a blue) + (P(picking an odd) - P(picking a blue odd)
1/13 + 3/26 - 1/26= (2 + 3 - 1)/26 = 4/26 = 2/13