Neither. Its a 50:50 probability. In the long run, heads will match tails.
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The probabilty of you flipping 3 coins and getting all heads or tails is 0.125 or 1/8.
The sample space when flipping a coin is [heads, tails].
Theoretical is 50% Heads, 50% tails: 30-Heads, 30-Tails (theoretical)
There are eight possible results when flipping three coins (eliminating the highly unlikely scenario of one or more coins landing on their edge): Dime - Heads / Nickel - Heads / Penny - Heads Dime - Heads / Nickel - Heads / Penny - Tails Dime - Heads / Nickel - Tails / Penny - Heads Dime - Heads / Nickel - Tails / Penny - Tails Dime - Tails / Nickel - Heads / Penny - Heads Dime - Tails / Nickel - Heads / Penny - Tails Dime - Tails / Nickel - Tails / Penny - Heads Dime - Tails / Nickel - Tails / Penny - Tails
It is 1/2.