Question

Two red and two blue blocks are placed into a bag.You take one of the blocks out of the bag.What is the probability the block is not red?

Answer 1

The probability of picking NOT A RED block is (1/2).

Explanation:

Number of Red blocks = 2

Number of Blue blocks = 2

Total blocks in the bag = 2 + 2 = 4

Let E: Event of Picking a red Block

Probability of any event E =
`\frac{\textrm{Number of favorable outcomes}}{\textrm{Total Outcomes}}`

Here, P(red block) = 2 /4 = 1/2

Now, As we know P(Event E) + P(Not E) = 1

Hence, P (not red block) = 1 - P(red block)

= 1 - (1/2) = 1/2

So, the probability of picking NOT A RED block is (1/2).