How can you use four rods that measure 2 cm 5 cm 7 cm and 9 cm to measure a length of 1 cm please help fast

Suppose i pick a jelly bean at random from a box containing one red and eleven blue ones. i record the color and put the jelly bean back in the box. if i do this three times, what is the probability of getting a blue jelly bean each time? (round your answer to three decimal places.)