The way I see it... When you say 'a hundred' or 'a million' you're just giving an order of magnitude, and the exact figure doesn't matter. So much so that when you say 'a million reasons not to do this' it obviously isn't important how many exactly.
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Sanzdifference betweenNo difference. A hundred is one hundred. One hundred is a hundred.
1. a hundred / a thousand / a million
2. one hundred / one thousand/ one million