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Let the three sides of a triangle are on the lines 4 x – 7 y + 10 = 0, x + y = 5 and 7 x + 4 y = 15. Then the distance of its orthocentre from the orthocent er of the triangle formed by the lines x = 0, y = 0 and x + y = 1 is

1. 20
2. 5
3. 5
4. 20

Correct answer: 5

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