we arrange all the letters of the word PERFORMANCE in the alphabetical order from the left end, then the position of how many letter(s) will remain unchanged?
P E R F O R M A N C E A C E E F M N O P R R
121, 240, 386, 555, 751, 976
38, 54, 73, 95, 135, 196
124, 186, 375, 930, 2790, 9765
5000, 4500, 3600, 2480, 1512, 756
134, 159, 186, 215, 266, 279
10 3 7 6 40 310
48, 112, 144, 192, 310, 732
5, 6, 8, 16, 38, 158
16 18 25 52 116 241 457
20.5, 30, 40.5, 53, 64.5, 78
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