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Let P be the foot of the perpendicular from the point Q(10, –3, –1) on the line 7 3 x − = 1 2 y − − = 2 1 z − + . Then the area of the right angled triangle PQR, where R is the point (3, –2, 1) is-

1. 15 9
2. 30
3. 15 8
4. 30 3

Correct answer: 30 3

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