ja

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

人気のある Word Problems >

You randomly select one card from a 52-card deck. Find the probability of selecting a red eight or a black nine.

解

Y o u r an d o m l y se l ec t o n e c a r d f ro m a ​ 52 - c a r d d ec k . F in d t h e p ro babi l i t y o f se l ec t in g a re d e i g h t or a b l a c k nin e .

解

\frac{1}{13}

+1

十進法表記

0.07692 \dots

解答ステップ

Find the probability of getting red 8 :

\frac{1}{26}

Find the probability of getting black 9 :

\frac{1}{26}

Since the events are disjoint, Use the formula

P (X_{1} \lor X_{2} \lor \dots \lor X_{k}) = P (X_{1}) + P (X_{2}) + \dots + P (X_{k})

= \frac{1}{26} + \frac{1}{26}

\frac{1}{26} + \frac{1}{26} = \frac{1}{13}

= \frac{1}{13}

人気の例

Seven plus a number is forty.Suppose that 12,000is deposited for seven years at 4% APR. Calculate the interest earned if interest is compounded monthly. Round your answer to the nearest cent.tim has five apples he gave three to amelia how many apples does time have now the sum of two numbers is 56. Their 差 is 18. Find the numbers Emmy earned some money doing odd jobs last summer and put it in a savings account that earns 4% interest compounded monthly. After 4 years, there is 800.00 in the account. How much did Emmy earn doing odd jobs?Round your answer to the nearest cent.