999,999,999 numbers less than 1,000,000,000.
29 x 59
one billion in numbers
7,888,888,908
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999,999,999 numbers less than 1,000,000,000.
-999999999
1000000000
10000000
29 x 59
1000000100 --------------- 1,000,100
100,000,000
one billion in numbers
2/1000000000 = 0.000000002
7,888,888,908
2, is the only one-digit even number that is a prime number.
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