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Question

If A={x,xZ and x24x+3x28x+150}, then n(A)=

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Solution

x24x+3x28x+150(x1)(x3)(x3)(x5)0(x1)(x5)0, where x3x[1,5){3}
Since, xZ
x{1,2,4}
n(A)=3

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