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If the circles x 2 + y 2 – 16x – 20y + 164 = r 2 and (x – 4) 2 + (y – 7) 2 = 36 intersect at two distinct points, then

1. r > 11
2. r = 11
3. 1 < r < 11
4. 0 < r < 1

Correct answer: 1 < r < 11

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