How many 10 digits numbers can be written by using the digits 1 and 2 ?
| A. | 10C1 + 9C2 |
| B. | 210 |
| C. | 10C2 |
| D. | 10! |
Answer : B Explanation : |
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Option: A Explanation : Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. |
