Question

If you have two pennies, the probability of both coming up heads when flipped is _____.
1/4
1/2
3/4
0/4

Answer 1

It's 1/4. ur possible outcomes are:
H H
T T
H T
T H
there are four possible outcomes and H H is what ur looking for. so it's 1/4

Answer 2

there are four side to 2 pennies 
both (2) coming up head out all the side (4)
there is a 2/4 chance then simplify by dividing by 2/2 and get ½
so you have ½ chance of both becoming heads

Hope this helps :D