Baloon problem

The Fantasy Travel Agency is offering 25% off the
admission fee to an amusement park to people who can
win this contest against another player. The object is to pop
the last of 21 balloons that are tied together for the contest.
The rules are:
1. There are 21 balloons in a bunch.
2. Two players must take turns popping exactly 1 or 2
balloons on each of their turns.
3. The player who pops the last balloon is the winner of
the contest and gets the prize.
Can you figure out how to win the prize each time you
take part in the contest?


After one person completes this can someone else solve the extension?
1 How would you win if there were 15 balloons and each
of you could pop exactly 1, 2, or 3 balloons?

Can someone else solve this one?
2. How would your strategy change if the player who

math problem

please post your comment / solution and the explanation. Suzanne was having a party at her house. The group was discussing birthdays and talking about planning parties. After listening for a while Suzanne said, "there is something interesting about my birthday. Two days ago I was 13, but next year I'll be 16." If Suzanne ws telling the truth, what kind of party was she having?