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/sci/ - Science & Math

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>> No.14868182 [View]
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14868182

(a) is 8C2 * 25^6
For (b) i'm getting "26^8 - (25^8 + 8*25^7)" (correct) and "8C2 * 26^6" (incorrect) as my answers. Why is "8C2 * 26^6" incorrect? Since theres 8 possible letters, I restricted 2 of those letters with 8C2 and populate the rest of the letters with 26.

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