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total natural no.
Total no. of natural no. from 1 to 1000 in which non of their digits is repeated
Re: total natural no.
In mathematics, you don't understand things. You just get used to them.
90% of mathematicians do not understand 90% of currently published mathematics.
I am willing to wager that over 75% of the new words that appeared were nothing more than spelling errors that caught on.