Find the eleventh term of the progression 4, 8, 16.....
A
213
B
212
C
211
D
210
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
a = 4, r = \(\frac{4}{2}\)
\(\frac{8}{4}\) = 2
n = 11
Tn = arn - 1
T11 = 4(2)11 - 1
4(2)10 = 212
since 4 = 22
= 212
Source: Myschool Past Questions Archive (Record #31921)