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Question

The range of the function f(x)=7xPx3 is

A
{1, 2, 3}
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B
{1, 2, 3, 4}
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C
{1, 2, 3, 4, 5}
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D
{1, 2, 3, 4, 5, 6}
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Solution

The correct option is A {1, 2, 3}
7xPx3 is defined for x if
x-3 0 and 7x x-3 = x 5
The domain is 3,4,5
f(3) = 4P0 =1,
f(4) = 3P1 =3,
f(5) = 2P2 =2,

The range is 1,2,3

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