Hey, i need help solving these problems

A teacher has a treats bag with six different types of candy/chocolate inside. What is the minimum number of pieces of candy must be taken to ensure that two of the same pieces of candy are picked?

You are running late, but still have a chance to make it to that important meeting on time. It normally takes 30 seconds to get from the first floor to your normal third floor, but you have to get to the twelfth floor. You have 2 minutes to get there. Will you get there on time? How many minutes early or late will you be? (Round to the nearest hundredth if necessary.)

It is arts and crafts time, and the kids want to make necklaces out of beads. We have 10 of the 8mm beads, 90 of the 4mm beads, and 20 of the 2mm beads. To the nearest inch, how much string is necessary to make the necklace? _________ in