+0

# help

0
51
3

Meyer rolls two fair, ordinary dice with the numbers  on their sides. What is the probability that at least one of the dice shows a square number?

Jan 16, 2019

#1
+16487
+1

Is 4 the only thing you consider a square number?          Or is six kinda square?    Or is '1' a square (1^2 = 1...so one is a square)...

need clarification   .....do you think 5 is a square on the die?

Jan 16, 2019
#2
+4033
+3

$$\text{The only two numbers appearing on each die that are perfect squares are }1 \text{ and } 4\\ P[\text{1 or 4 appear on at least 1 die out of 2}] = 1 - P[\text{no 1s or 4s}] = \\ 1-\dfrac{4^2}{36} = \dfrac{20}{36} = \dfrac{5}{9}$$

.
Jan 16, 2019
#3
+21358
+7

Meyer rolls two fair, ordinary dice with the numbers  on their sides.
What is the probability that at least one of the dice shows a square number?

$$\color{red}\text{square number}$$

$$\begin{array}{|r|r|r|r|r|r|r|r|} \hline & \text{dice 2} & {\color{red}1} & 2 & 3 & {\color{red}4} & 5 & 6 \\ \hline \text{dice 1} & & & & & & & \\ \hline {\color{red}1} & & \times & \times & \times & \times & \times & \times \\ \hline 2 & & \times & & & \times & & \\ \hline 3 & & \times & & & \times & & \\ \hline {\color{red}4} & & \times & \times & \times & \times & \times & \times \\ \hline 5 & & \times & & & \times & & \\ \hline 6 & & \times & & & \times & & \\ \hline \end{array}$$

$$\text{The probability is \dfrac{20}{36} = \dfrac{5}{9} \quad (55.6\ \%)  }$$

Jan 16, 2019