Wen Guotai Daniel's answer to Khafabi Gustan's Junior College 1 H1 Maths question.
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Handwriting a bit messy. Hope you can see the trail of thoughts behind the formulas. Please work out the numerical values yourself. Cheers!
Date Posted:
7 years ago
Why the last 26^5*10*6 still mutliplied by 6??
Because the digit can be ahead, inbetween or behind. There are 6 locations.
Basically permutation.
Ohhh i see... Tyvm
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