Answer:
11/16 probability
Explanation:
9+2+5=16 Crayons total.
The Probability for a red crayon to be chosen is a 9/16 chance.
The Probability for a blue crayon to be chosen is a 2/16(1/8 simplified) chance.
The probability for a yellow crayon to be chosen is a 5/16 chance.
The probability for a red or a blue to be chosen is an 11/16 chance.
Hope this isn't too confusing and helps