Question

A jar has 9 pennies.

3 nickels, 8 dimes, and
5 quarters. A coin is chosen
at random, not replaced
then another is chosen.
Find the probability that
a quarter was chosen
followed by a penny,

Answer 1

3/40

Explanation:

Probability (Quarter 1st) :

⇒ Number of quarters / Number of coins

⇒ 5 / 9 + 3 + 8 + 5

⇒ 5/25

⇒ 1/5

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The coin is not replaced.

Probability (Penny 2nd) :

⇒ No. of pennies / Total - 1

⇒ 9 / 25 - 1

⇒ 9/24

⇒ 3/8

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Probability (both) :

⇒ 1/5 × 3/8

⇒ 3/40