Gives
Dielectric material=k1,k2,k3
Let us assume d'=2d
C1=2d′ϵ0(2A)k1=4d′Aϵ0k1
C2=d′ϵ0(2A)k2=2d′Aϵ0k2
C3=2d′ϵ0(A)k3
C=C1+C1+C3C2C3
C=4d′Aϵ0[k1+k2+k32k2k3]
C=2d′Aϵ0[2k1+k2+k3k2k3]
C=dAϵ0[2k1+k2+k3k2k3]
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