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Value of 'alpha' for which system of equ...

Value of `'alpha'` for which system of equations `x+y+z=1,x+2y+4z=alpha` and `x+4y+10 z=alpha^2` is consistent, are

A

(a) 1,2

B

(b) -1,2

C

(c) 1, -2

D

(d) -1, -2

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