There are 8 possible outcomes when you throw a coin three times:

Out of these combination, the ones with exactly two heads are

So, 3 combinations out of 8 have exactly two heads. This means that the probability of having two heads with three coin throws is 3/8
So what you need to do is find the less he can use.
Answer:
the first one
Step-by-step explanation:
The are of the triangle will be 12.5 units.
On marking the given vertices (0,0), (0,5), (5,5) of the triangle we get, the base of the triangle = 5 units and height of the triangle = 5 units.
Now, we know area of triangle =