Question

A security alarm requires a four-digit code. The code can use the digits 0–9 and the digits cannot be repeated. What is the approximate probability that the code only contains odd numbers? 0. 0005 0. 00099 0. 012 0. 2381.

Answer 1

The answer would be the last one, 0.2381

Explanation:

The answer is 0.2381 because of the formula

10(10|B)=10(A∩B) / 10(B)

for this question specifically, this would equal 0.2381