60% chance or 3/5 probability
Here are the different probabilities by flipping the coin 4 times. H=heads T=tails
HHHH HHHT HHTT HTTT TTTT
1/5 1/5 1/5 not 1/5 not 1/5
If there are 2 or more heads in one of these pairs that pair is 1/5 of the total pairs.
3/5 probability that there will be 2 or more heads flipped, or 60%
P.S- it is also a 3/5 chance for 2 or more tails to be flipped also.