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Find the eleventh term of the progression 4, 8, 16.....

Mathematics
JAMB 1987
Find the eleventh term of the progression 4, 8, 16.....
  • A. 213
  • B. 212
  • C. 211
  • D. 210
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Correct Answer: Option B
Explanation
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
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