There are 20! number of ways for everyone to do this so that at the end of the move, each seat is taken by exactly one person.
People are seated in a 2 by 10 rectangle grid. All 20 persons stand up from their seats and relocate to an orthogonally neighboring one upon the blowing of a whistle.
Now, we have to find the number of possible ways in which each seat is taken up by exactly one person after the move.
As the number of people is 20 and 20 seats are to filled exactly once.
So, the number of ways = 20!
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Answer:
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Step-by-step explanation:
Answer:
Find out the what is the eighth term in the arithmetic sequence defined by the explicit formula.

To prove
As given the explicit formula for the arithmetic sequence .

Put n = 8



Therefore the eighth term in the arithmetic sequence is 23 .
Answer: sec (75) or csc (15)
Step-by-step explanation:
255 is in the 3rd quadrant where the secant is. Here, the tangent and cotangent is positive.
Reference angle for 255 is,
255 - 180 = 75 degrees.
Therefore, sec (255) = sec (75)
= csc (90 - 75) = csc (15)
Lisa's cut will be represented by the equation y = 1/4x + 4