101
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To get the numbers 1-100 using four nines, you can use various mathematical operations such as addition, subtraction, multiplication, division, exponentiation, factorial, square root, concatenation, and decimal point. For example, you can get 1 by taking the square root of 9, 2 by adding 9/9 to 9, 3 by concatenating two nines to get 99 and dividing by 9, and so on. With careful manipulation and creativity, you can achieve all numbers from 1 to 100 using four nines.
99/9 + 9 = 20
its impossible for 4 nines to equal 20
.05
99+9/9 which translates to 99+1 (get ur calculators if u want to check, its a tough one *rolls eyes*)
99/9=11