Infinitely many.
Infinitely many.
An infinite number.
1000
99 of them.
600 000 000 000
600 of them. Any number from 300 tp 899 (inclusive), to the nearest 600.
6 600 000 000.
3 and these are 600,650,and 700
600
1000
2 870 million
Almost 600 000, and almost 600 000 in reserve.