Answer:
It should be the last one because rigid transformations doesn't change in size just where it is
There are ten time slots for these appointments. For the first time slot, there are 15 different students that can fill the slot. Next appointment, there are only 14 possible students since we already saw one. This goes on and on, 15 x 14 x 13... for 10 different time slots.
<span>15 x 14 x 13 x 12 x 11 x 10 x 9 x 8 x 7 x 6 = 10,897,286,400
</span>
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Here you go: the answers
7. C
8. A
1+200000-1+200000
200001-1+200000
200000+200000
400000