Answer:
The geometric sequence is
1 , 2 , 4 , 8
where a = 1 and b = 8
Step-by-step explanation:
let a= first term
b= last term
a , 2 , 4 , b
Looking at the geometric sequence we get the common ratio by 2.
4÷2 = 2(common ratio)
To get the first term.We will divide the second term by 2.
2÷2 = 1 (first term or a)
To get the last term.We will multiply the third term by 2.
4x2 = 8(last term or b)
We get the geometric sequence:
1 , 2 , 4 , 8
Thus a= 1 and b=8
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