Question 15
ProgressionsIf U1 = 2, Un+1 = 2Un + 1, find U4
- A.15
- B.47
- C.23
- D.31
Show the answer and explanation
Answer: C (23)
Explanation
U₂ = 2(2) + 1 = 5, U₃ = 2(5) + 1 = 11, U₄ = 2(11) + 1 = 23.
If U1 = 2, Un+1 = 2Un + 1, find U4
Answer: C (23)
U₂ = 2(2) + 1 = 5, U₃ = 2(5) + 1 = 11, U₄ = 2(11) + 1 = 23.