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Find the nth term of the sequence 3, 6, 10, 15, 21…..

Find the nth term of the sequence 3, 6, 10, 15, 21…..
  • A.
    (frac{n(n – 1)}{2})
  • B.
    (frac{n(n + 1)}{2})
  • C.
    (frac{(n + 1)(n + 2)}{2})
  • D.
    n(2n + 1)
Correct Answer: Option C
Explanation

(frac{(n + 1)(n + 2)}{2})
If n = 1, the expression becomes 3
n = 2, the expression becomes 6
n = 4, the expression becomes 15
n = 5, the expression becomes 21