Medium
Find the sum of the geometric series : 1−0.99+0.992−0.993+…−0.99791-0.99+0.99^{2}-0.99^{3}+\ldots-0.99^{79}1−0.99+0.992−0.993+…−0.9979
0.28 0.280.28
−0.45-0.45−0.45
0.730.730.73
55.2455.2455.24
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