Question

John’s piggy bank contained 7 dimes and 3 quarters. He pulled out 1 coin without looking. Without replacing the first coin, John then pulled out a second coin.

What is the probability that both coins were dimes? Express your answer in simplest form.

Answer 1

\[\frac{ ? }{ ? }\]

Answer 2

@inowalst

Answer 3

@JohnKnows

Answer 4

@mavagirl552000

Answer 5

@CaseyBabe

Answer 6

plz help

Answer 7

the first dime, how many ways can that occur,

Answer 8

7 dimes total or 10 coins total

Answer 9

ok, so the chance to pick a dime will be 7/10, right?

Answer 10

now once you pick a dime, there are 6 dimes left (out of 9 coins).
multiply probabilities

Answer 11

$$
\Large \frac{7}{10}\cdot \frac{6}{9}

$$

Answer 12

oh ok so it is\[\frac{ 42 }{ 90 }\]

Answer 13

or\[\frac{ 21 }{ 45 }\]