D = 1 + 32 + 33 + 34 + ...... + 3100
D = 30 + 32 + 33 + 34 + ...... + 3100
3D = 31 + 33 + 34 + ...... + 3100 + 3101
3D - D = (31 + 33 + 34 + ...... + 3101) - (30 + 32 + 33 + 34 + ...... + 3100)
2D = (31 + 3101) - 30
2D = 3 + 3101 - 1
2D = 2 + 3101
D = \(\frac{2+3^{101}}{2}\)