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The direction ratios of normal to the plane through the points (0, –1, 0) and (0, 0, 1) and making an angle 4 π with the plane y – z + 5 = 0 are :

1. 2, –1, 1
2. 3 2 , 1, –1
3. 2 , 1, –1
4. 2, 2 , – 2

Correct answer: 2 , 1, –1

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