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Question

The domain of 9xPx2 is

A
x{2,3,4,5,6}
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B
x{2,3,4,5}
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C
x{3,4,5}
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D
x{3,4,5,6}
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Solution

The correct option is B x{2,3,4,5}
We know that for nPr,
n>0, r0, nr & n,rI

For 9xPx2, we have
9x>0, x20, 9xx2
x<9, x2, x112
x2 & x112
x{2,3,4,5}

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