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| Q.22 | Two circles having radii 12 cm and 8 cm, respectively, touch each other externally. A common tangent is drawn to these circles which touch the circles at M and N, respectively. What is the length (in cm) of MN? | |
| Ans | 1.  | |
2.  | ||
3.  | ||
4.  |
Correct Ans: 3
