The factorial ! just means we multiply by every natural number less that the value so
6! =6×5×4×3×2×1= 720
for permutations we use the formula n!/(n-r)!
so we have 8!/(8-5)!=8!/3!=8×7×6×5×4
for combinations s we have n!/(n-r)!r!
so we have 12!/(12-4)!4!=12!/8!4!=12×11×10×9/4×3×2=11×10×9/2=99×5
I think it would be 21 points total for 7 correct awnsers I did the math hope it helps
That easy just divide 9 by 22 if need simplify it
Two neon lights turned on at same time.
one blinks other blinks
every 4 seconds every 6 seconds.
ob ob
4 : 6
60.
60 / 4 = 15
60 / 6 = 10.
15+ 10 = 25 times.
