Identify the Sequence 8 , 20 , 50 , 125

$8$ , $20$ , $50$ , $125$

Step 1

This is a geometric sequence since there is a common ratio between each term. In this case, multiplying the previous term in the sequence by $\frac{5}{2}$ gives the next term. In other words, $a_{n} = a_{1} r^{n - 1}$ .

Geometric Sequence: $r = \frac{5}{2}$

Step 2

This is the form of a geometric sequence.

$a_{n} = a_{1} r^{n - 1}$

Step 3

Substitute in the values of $a_{1} = 8$ and $r = \frac{5}{2}$ .

$a_{n} = 8 {(\frac{5}{2})}^{n - 1}$

Step 4

Apply the product rule to $\frac{5}{2}$ .

$a_{n} = 8 \frac{5^{n - 1}}{2^{n - 1}}$

Step 5

Combine $8$ and $\frac{5^{n - 1}}{2^{n - 1}}$ .

$a_{n} = \frac{8 \cdot 5^{n - 1}}{2^{n - 1}}$

Identify the Sequence 8 , 20 , 50 , 125

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