MCQOPTIONS
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| 1. |
When we add fourth and fifth triangular number we get ______ |
| A. | 5<sup>2</sup> |
| B. | 6<sup>2</sup> |
| C. | 25<sup>2</sup> |
| D. | 25<sup>3</sup> |
| Answer» B. 6<sup>2</sup> | |