Instructions
A sequence of numbers or alphabets following a specific pattern is given. Fill in the blanks with suitable entry from the options that follows the same pattern.
Solution
f(n)$$=\frac{n\left(n+1\right)\left(n+2\right)}{6}.$$
So,$$f(1)=1$$
$$f(2)=4$$
$$f(3)=10$$
$$f(4)=20$$
$$f(5)=35$$
So,B is correct choice.
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