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[(^nC0+^n C3+)-1/2(^n C1+^n C2+^n C4+^n ...

`[(^nC_0+^n C_3+)-1/2(^n C_1+^n C_2+^n C_4+^n C_5]^2 + 3/4(^n C_1-^n C_2+^n C_4 +)^2=` a.`3` b. `4` c. `2` d. `1`

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