How-many-six-digit-numbers-contain-exactly-six-different-digits-

Question Number 124372 by mr W last updated on 02/Dec/20

H o w m a n y s i x - d i g i t n u m b e r s c o n t a i n

e x a c t l y s i x d i f f e r e n t d i g i t s ?

Answered by bemath last updated on 02/Dec/20

= 9 \times P_{5}^{9} = 9 \times \frac{9!}{4!}

= 9 \times 9 \times 8 \times 7 \times 6 \times 5 = 136080

Commented by mr W last updated on 03/Dec/20

t h a n k s!

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