The coefficient of \( t^{2} \) in the expansion of \( 1 \cdot(1+t)^{20}+ \) \( 2 t(1+t)^{19}+3 t...
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The coefficient of \( t^{2} \) in the expansion of \( 1 \cdot(1+t)^{20}+ \) \( 2 t(1+t)^{19}+3 t^{2}(1+t)^{18}+\ldots+20 t^{29}(1+t)+21 t^{20} \) is
(A) 141
(B) 272
(C) 231
(D) 37
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