1.

If the three planes rcdotn_1=p_1, rcdotn_2=p_2 and rcdotn_3=p_3 have a common line of intersection, then p_1(n_2timesn_3)+p_2(n_3timesn_1)+p_3(n_1timesn_2) is equal to

Answer»

`1`
`2`
`0`
`-1`

ANSWER :(B)


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