A few days ago
Anonymous

” A card is drawn form a deck of cards numbered one through twenty. The card is NOT REPLACED and another card is drawn. Find the probability of the outcome”

question 1: two even numbers are drawn in a row

question 2: an even number then an odd number

Please if you can show me how to do math or explain your thinking.

-thanks alot 🙂

A few days ago
Anonymous

(1) The probability of drawing an even number off the bat is 10/20. The probability of drawing a second even number is 9/19. Think about it: you’ve already drawn an even card without replacing it, so there are 9 even cards left out of 19 remaining cards.

The probability is (10/20)*(9/19)= 9/38

(2) The probability of drawing an even number is again 10/20. The probability of drawing an odd number, now that there are only 19 remaining cards, is 10/19. Unlike in (1), there are still 10 odd cards left in the deck.

The probability is (10/20)*(10/19)= 5/19

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A few days ago
Austin L
A1. 25%

A2. 50%

a1 do a diagram with heads and tails. there are only two kinds of numbers.(2 posibilities)

a2 really easy. 50-50

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