Class 11MathematicsSequences and Seriesnth term of special series, Sum to n terms and Infinite number of terms
DifficultIf $1 \cdot 3 \cdot 5 + 3 \cdot 5 \cdot 7 + 5 \cdot 7 \cdot 9 + \dots$ to $n$ terms $= n(n+1) f(n)$,then $f(2) =$
- A$12$
- B$42$
- C$18$
- D$20$
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