21. Given that A + B + C
= 0. Out of three vectors A,b,c
two are equal in magnitude and the magnitude
of the third vector is 2 times that of either vector having equal magnitudes. Then the angle between the
vectors is
(1) 30, 60, 90 (2) 45, 45, 90 (3) 45, 60, 90 (4) 90, 135, 135
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