Alison has 6 yellow discs, 5 blue discs and 9 red discs which she places in a bag. When she draws one disc out, what is the probability that the disc is NOT red?

 11/20

explanation:

We know that, Alison has 6 yellow discs, 5 blue discs and 9 red discs

so total he has 6 + 5 + 9 = 20 discs in total

to find the probability of the disc is not red

we have to use the formula :     total disc - red disc / total discs

                                                  20 - 9 / 20

                                               11/20 is the probability of not getting a red disc

OR,

         =   red disc / total discs

         =    9/20

       =     11/20

11/20

The total number of discs are 6+5+9 is 20... and the number of discs that are not red is 20-9 which is 11. So,

11/20

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step-by-step explanation: