Answer: 
Step-by-step explanation:
Given
The total no of beads is 52
there 13-red,13-blue,13-green, and 13-black
favorable outcomes to select a blue bead is 13
Total outcomes are 52
Probability is given by

Answer:
50 Days
Step-by-step explanation:
500000/10000 =50
Answer:
then the diameter is 20
Step-by-step explanation: