Assume you're taking a vaccine
Probability of side effects is 0.01 for each jab
You take one jab, that is probability 0.01 you'll have side effects
You take second jab, what is the probability you'll have side effects (meaning, cumulative)?
What is the case if you go up to 5th shot (booster)? And how many boosters would it take for you to more likely than not have side effects (cumulative probability is >50%).