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1.2+2.3+3.4+-------- ধারাটির n-তম পদ পযর্ন্ত যোগফল-

S_{n} = \frac{1}{2} [n (n + 1) (n + 2)]

S_{n} = \frac{1}{3} [(n + 1) (n + 2)]

S_{n} = \frac{1}{3} [n (n + 1) (n + 2)]

S_{n} = \frac{1}{2} [(n + 1) (n + 2)]

ANS : 3

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