Question

The probability of getting an even number on spinning the wheel is $\frac{1}{2}$ and that of a prime number $\frac{4}{6}$.What could be the missing number on the wheel?

• A. $1$
• B. $2$
• C. $4$
• D. $9$

Answer 1

The correct option is B $2$

Total number of outcomes = $6$

Number of even numbers = $6\times \frac{1}{2}=3$

Number of prime numbers = $6\times \frac{4}{6}=4$

At present, there are $2$ even numbers and $3$ prime numbers on the wheel.

So, the missing number should be both even and a prime.

$\therefore$ The missing number is $2$. (2 is the only even prime number)

Answer is $\left[B\right]$.