A spider walks about 19cm each second. About how long would it take the spider to walk a perimeter of the room 3m wide 4m long?
1 answer:
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Answer:
b. 70
Step-by-step explanation:
The Binomial Coefficient can be used to calculate the number of ways objects can be arranged.
<u>Binomial Coefficient</u>
The exclamation mark "!" placed after a number means factorial and indicates to multiply all whole numbers from the given number down to 1.
Example: 4! = 4 × 3 × 2 × 1
The Binomial Coefficient gives us the number of ways of picking "r" unordered outcomes from "n" possibilities.
As there are 8 friends ⇒ n = 8.
As each car takes 4 friends ⇒ r = 4.
Substitute these values into the formula:
Learn more about the binomial coefficient here:
Answer:
3
Step-by-step explanation:
Let the missing number be .
Then we have
We expand the right hand side to get:
By comparing constant terms we get:
Divide both sides by -15
Therefore the missing number is 3