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Three planes P1 ,P2,P3, are given 3x+15y...

Three planes `P_1 ,P_2,P_3,` are given `3x+15y+21z=9 , 2x+y-z=4 , 2x+10y+14z=19/5` respectively then which of the following is correct.

A

`P_1` is parallel to `P_2`

B

`P_3` is parallel to `P_2`

C

`P_1` is parallel to `P_3`

D

`P_1 , P_2 , P_3` are parallel to one another

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