You roll an unbiased six-sided die four times in a row. what is the probability that it comes up 4, 5 or 6 the first three rolls, and a 6 on the last roll?

the first option is the answer.

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.