The probability you'd get heads is still one half.
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-- 8 possibilities if the coins are different colors. -- Only 4 possibilities if you can't tell the coins apart.
Form a triangle with the six coins. Now you have 3 rows with 3 coins in each row!
Ok, I'm admittedly not a probability geek, but here is my reasoning... if you flip two coins there are only two possibilities... alike or different, and that's 1 in 2 or 50/50 odds. When you add the third coin it's automatically going to match at least one of the other two... unless the other two were alike and it falls differently. so it does decrease the probability of all matching, and there are three opportunities for one of the coins to be different. So I say it's 1 in 3.
3 dimes, 2 nickels, and 3 pennies
No, you cannot make 26cents with 3 USA coins. with 2 coins - 1 quarter and 1 penny with 4 coins - 2 dimes, 1 nickel and 1 penny with 5 coins - 1 dime, 3 nickels and 1 penny with 6 coins - 5 nickels and 1 penny etc