Answer:
it's A
(15 * 10 ^ 5) binom 5*10^ 3 ) =300
(15 * 10 ^ 5)/(5 * 10 ^ 3)
(10 ^ 5)/(10 ^ 3) = 10 ^ 2
= (15 * 10 ^ 2)/5
: 15/5 = 3
= 3 * 10 ^ 2 = 3 * 10 ^ 2
3 * 10 ^ 2 = 300
=300
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