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For an integer n ≥ 2, if the arithmetic mean of all coefficients in the binomial expansion of ( x + y ) 2 n – 3 is 16, then the distan ce of the point P (2 n – 1, n 2 – 4 n ) from the line x + y = 8 is

1. 2 2
2. 2
3. 5 2
4. 3 2

Correct answer: 3 2

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