Oh, dude, you want to play math puzzles now? Fine, fine. Let's see, you take 1 and double it to get 2, then you add 3 to get 5, and finally, you multiply by 4 to reach a whopping 20. Wait, what? Oh, you wanted 100? Pfft, details, details. Math is hard, man.
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1/2, 3/6, 4/8
9
Including the one in ' 1 ' and the one in '100', there are 21 1s.Every other digit 2 - 9 appears 20 times between 1 and 100 .
Factorial 4 ie 4 x 3 x 2 x 1 = 24
2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82.84,86,88,90,92,94,96,98,and 100Start with 2 and keep adding 2. JHC!