Suppose you roll a number cube. what is the theoretical probability of rolling a number less than 6?

Probability  = desired outcomes / total possible outcomes.

 desired outcomes = rolling numbers less than 6

                                = {1,2,3,4,5}

                                = 5 desired outcomes

total possible outcomes=  {1,2,3,4,5,6 }

                                   = 6 possible outcomes

so 5/6

your question is incomplete, write all the numbers in the sequence that it tells you.  

step-by-step explanation:

x = 3 ± √(5+y)