[" 19.If "|[alpha,x,x,x],[x,beta,x,x],[x...

[" 19.If "|[alpha,x,x,x],[x,beta,x,x],[x,x,gamma,x],[x,x,x,delta]|=f(x)-xf'(x)" then "f(x)" is equal to "],[[" (a) "(x-alpha)(x-beta)(x-gamma)(x-delta)],[" (b) "(x+alpha)(x+beta)(x+gamma)(x+delta)],[" (c) "2(x-alpha)(x-beta)(x-gamma)(x-delta)],[" (d) none of these "]]

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