An elevator starts at the basement with 8 people (not including the elevator operator) and discharges them all by the time it re
aches the top floor, number 6. In how many ways could the operator have perceived the people leaving the elevator if all people look alike to him
1 answer:
Answer:
1287
Step-by-step explanation:
Number of people in elevator , n = 8
Number of floors, r = 6
Since they all look alike, arrangement doesn't matter, the we use combination :
(n+r-1 r - 1) = (8+6-1 C 6-1) = 13C5
Recall:
nCr = n! / (n-r)!r!
13C5 = 13! / (13-5)!5!
13C5 = 13*12*11*10*9 / 5*4*3*2*1
= 1287
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36/42
multiply the top and bottom by 6.
7 x 6 = 42
6 x 6= 36
Answer:
the answer for your question is 1200pi
Answer:
2x=10
Step-by-step explanation:
7x-14=21
x=5
2x=10 (divide both sides by two)
2x/2 10/2
<u>x=5</u>
Answer:
1.) Some
Step-by-step explanation:
Natural numbers do not contain negative numbers, but they do contain whole numbers like 1, 2, 3. So your answer would be some.
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