3 years ago

Question 2 Unsaved

1 answer:

5 0

Each time the value of n increases by 1, the value of an increases by a factor of 3. The 3rd choice is appropriate.

_____
When an expression like this one is written in plain text, it is appropriate (required) to put parentheses around the exponent that contains an arithmetic operation.
an = 4·3^(n-1)

If you leave off the parentheses, the expression no longer describes a geometric sequence.

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3 years ago

There are 25 students that would like to go on a field trip, but only 18 may go. How many different combinations of students cou

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The key to solve this problem is using the combination formula $nC_{r}=\frac{n!}{r!(n-r)!}$ . This mean the number of ways to choose a sample of r elements from a set of n distinct objects where order does not matter and replacements are not allowed.