Question

There are 12 varieties of birds in a zoo, the number of each variety being

double of the number of another variety. If the number in the first
variety is 3, find the number in the last variety and also total number of
all varieties of birds in the zoo.maths gp
​

Answer 1

below

Explanation:

Geometric series with first term 3 and common ratio r.

Last variety = 3 * 2^(12-1) = 6144.

Total = 3 * (2^12 - 1) / (2-1)

= 12285