Question 5
ProgressionsIf Un = n(n2 + 1), evaluate U5 − U4.
- A.18
- B.56
- C.62
- D.80
Show the answer and explanation
Answer: C (62)
Explanation
U5 = 5 × 26 = 130 and U4 = 4 × 17 = 68. 130 − 68 = 62.
If Un = n(n2 + 1), evaluate U5 − U4.
Answer: C (62)
U5 = 5 × 26 = 130 and U4 = 4 × 17 = 68. 130 − 68 = 62.