若(1+x)ⁿ=a₀+a₁x+a₂x²+…+a_nxⁿ中，a₃=a₁₂，則自然數(shù)n的值是(    )

A.13              B.14                C.15               D.16

若(1+3x)ⁿ的展開(kāi)式中，第5項(xiàng)與第10項(xiàng)的二項(xiàng)式系數(shù)相等，則展開(kāi)式的項(xiàng)數(shù)為(    )

A.16                 B.15                C.14                D.13

若(1+x)ⁿ=a₀+a₁x+a₂x²+…+a_nxⁿ中，a₃=a₁₂，則自然數(shù)n的值為(    )

A.13                B.14                C.15                 D.16

集合{0,1,3,4}的所有子集的個(gè)數(shù)為(    )

A.4                B.14                  C.15                  D.16

若a₁(x-1)⁴+a₂(x-1)³+a₃(x-1)²+a₄(x-1)+a₅=x⁴,則a₂+a₃+a₄等于(    )

A.32                  B.16              C.15                  D.14