2021
Mathematics
67ca00ce0c643c71d77dee1f
What is the n-th term of the sequence 2, 6, 12, 20...?
A.
4n - 2
B.
2(3(n - 1))
C.
n2 + n
D.
n2 + 3n + 2
Correct Answer: n2 + n
Explanation
Given that 2, 6, 12, 20...? the nth term = n2 + n check: n = 1, u1 = 2 n = 2, u2 = 4 + 2 = 6 n = 3, u3 = 9 + 3 = 12 ∴ n = 4, u4 = 16 + 4 = 20
Given that 2, 6, 12, 20...? the nth term = n2 + n check: n = 1, u1 = 2 n = 2, u2 = 4 + 2 = 6 n = 3, u3 = 9 + 3 = 12 ∴ n = 4, u4 = 16 + 4 = 20THIS WEEK's
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