Coin Flips

• Flip a coin thrice

• zero heads and three tails (ttt)
• one head and two tails (tth, tht, htt)
• two heads and one tail (thh, hth, hht)
• three heads and zero tails (hhh)

• Calculate using combinations

• n choose k: n! / [ ( n - k )! * k! ]
• 3!/[(3-0)!*0!]+3!/[(3-1)!*1!]+3!/[(3-2)!*2!]+3!/[(3-3)!*3!]
• 1 + 3 + 3 + 1 = 8 different ways