Which explicit formula can be used to find the number of rabbits in the nth generation ?

Option B. an = 3• 6ⁿ¯¹

Step-by-step explanation:

The following data were obtained from the question:

First generation = 3

2nd generation = 1st generation x 6

2nd generation = 3 x 6 = 18

3rd generation = 2nd generation x 6

3rd generation = 18 x 6 = 108

Therefore, we can thus form a sequence as:

3, 18, 108

Since the 2nd term is obtained by multiplying the previous term (i.e the 1st term) by 6 and also, the 3rd is obtained by multiplying the 2nd by 6, the sequence is a geometric progression.

Thus,

The common ratio (r) = 6

The first term (a) = 3

The nth term (an) =?

The nth term of geometric progression is given as

an = arⁿ¯¹

Inputing the value of the first term (a) and common ratio (r) into the above equation, we obtained:

an = arⁿ¯¹

an = 3• 6ⁿ¯¹

Therefore, the explicit formula which can be used to find the number of rabbits in the nth generation is

an = 3• 6ⁿ¯¹

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