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USING PROBABILITY FORMULA
1. What is the probability that a card taken from a standard deck is a black ace?
2. what is the probability that a card taken from a standard deck is a number card ?
3. A spinner is numbered from 1 to 20:. what is the probability of getting a composite number?
4. A die rolled one time, what is the probability that the die is odd number?
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A deck has 52 cards (without jokers).
There are four aces, only two of them are black.
So there are 2/52 black aces in a deck.
Thus, 2 out of 52 is the probability of drawing a black ace from the deck.
If you count an ace as a number card there are 40 in a pack so p(get a number card) = 40/52 = 10/13.
If aces don’t count then there are 9 x 4 = 36 in a pack so p(get a number card) = 36/52 = 9/13.
It is 3/8
If you are asking about a standard six-sided die with the sides numbered 1 to 6, the odds you will get an odd number is 50%. The odds you will get an even number is also 50%.