If Un n n2 1 evaluate U5 - U4 - WAEC Mathematics 2013 Question
If Un = n(n2 + 1), evaluate U5 - U4
A
18
B
56
C
62
D
80
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Correct Option: C
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
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