If Un = n(n2 + 1), evaluate U5 – U4
- 18
- 56
-
62
- 80
The correct answer is: C
Explanation
Un = n(n2 + 1)U5 = 5(2 + 1)
= 5(25 + 1)
= 5(26) = 130
U4 = 4(42 + 1) = 4(16 + 1)
= 4(17) = 68
U5 - U4 = 130 - 68
= 62