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1.

C_e= (C_1 C_2 C_3)/(C_2 C_3+ C_1 C_3+ C_1 C_2 )

2.

C_e= C_1+ C_2+ C_3

3.

C_e= C_3+ (C_1 C_2)/(C_1+ C_2 )

4.

C_e= (C_1 C_2+ C_1 C_3)/(C_1+ C_2 〖+ C〗_3 )

5.

C_e= C_1+ (C_2 C_3)/(C_2+ C_3 )