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The probability of 2 coins both landing on heads or both landing on tails is 1/2 because there are 4 possible outcomes. Head, head. Head, tails. Tails, tails. Tails, heads. Tails, heads is different from heads, tails for reasons I am unsure of.
they made stone heads
By using all six match sticks only once the maximum number of Roman numerals that can be made are three i.e. I, II and III (1, 2 and 3).
One or more heads.
Talking Heads ended in 1991.