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It says "in one year".
In my scenario.
Year 1. 100 condom using people. 2 pregnancies
Year 2. 100 condom using people. 2 pregnancies
Year 3. 100 condom using people. 2 pregnancies
Year 4. 100 condom using people. 2 pregnancies
Year 5. 100 condom using people. 2 pregnancies
In the other scenario something like this:
Year 1. 100 condom using people. 2 pregnancies
Year 2. 100 condom using people. 0 pregnancies
Year 3. 100 condom using people. 0 pregnancies
Year 4. 100 condom using people. 0 pregnancies
Year 5. 100 condom using people. 0 pregnancies
I think they mean the first.
OR ... say there is a 1 in 1000 chance of getting pregnant each time a condom is used. The chances of getting pregnant after having sex once is 1 in 1000. The chances of getting pregnant after having sex 10 times is not STILL 1 in 1000 total. It is now 1-(999/1000)^10.
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