9 is a magical number whay?
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Step-by-step explanation:
9 considered a magical number? If you find the ultimate sum of digits(sum of digits till you get a single digit) of any multiple of 9,you will get 9.Therefore 9 is called magical no.For eg. let's take 9*99=891.Now the ultimate sum is 8+9+1=18 i.e again 1+8=9
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