Favorable outcomes obtained when we roll a die are 1,2,3,4,5 and 6.
All the outcomes obtained are less than 8.
Let P(N<8) denotes the probability of obtaining a number less than 8 on rolling the die.
P(N<8)=Number of favourable outcomesTotal number of outcomes
In this case,
Number of favourable outcomes =6
Total number of outcomes =6
P(N<8)=66
P(N<8)=1
We can say that rolling a number less than 8 is a certain event because all the numbers on a die are less than 8.
Hence, the probability of rolling a number less than 8 is 1.