Question

getting a bead from a packet containing 3 blue and 7 yellow beads

Answer 1

The chance is 100% for getting a bead. But it may vary if we are to take the probability of any specific colour. The answer could be simply 100% as if we take any bead, there is full chance if getting a bead either blue or yellow.

Answer 2

the chance of getting a bead from that pack is 100%. and probably i should say 1