How many military participated in World War 1?

Answer 1

Some include France, England, Hungary, and Austria.

I assume you mean how many men were in the military of the Allies and the Axis alliance (The Triple Entente which had included France, Britain, Russia, and the US who joins in 1917. The Triple Alliance contained Germany, Italy, Austria-Hungary.)
These are approximately the results in 1914;
Germany had 2,000,000 soldiers, 97 warships.
Austria-Hungary had 810,000 soldiers, 28 warships.
Italy had 750,000 soldiers, 36 warships.
France had 1,250,000 soldiers, 62 warships.
Russia had 1,200,000 soldiers, and 30 warships.
Lastly Great Britain had 711,000 soldiers and 185 warships.
These only go for the year 1914, I am not sure about the end of the war but this is the closest.
The US is not included because they do not join the Triple Entente until 1917.