one billion
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Yes. 1 followed by 9 0's or 9 zeros. (1,000,000,000)
Nine zeros equals zero. A one followed by nine zeros is a billion.
9 zeros
7500 followed by 9 zeros; that is 75 followed by 11 zeros in all
A billion is 1,000,000,000, that is 1 followed by 9 zeros. So 13.5 billion is 13.5 x 1000000000 = 13500000000