The angle between the planes x+y+2z=6   and 2x-y+z=9 is

a) 45                                b)  30                      c) 60                          d) 90

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dineshAptitude
The angle between the planes x+y+2z=6   and 2x-y+z=9 is a) 45                                b)  30                      c) 60                  ...