Number of 4 digited numbers with distinct digits...are divisible by 9..i got 516...i got confusion kidly help me


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Question Number 179358 by SLVR last updated on 28/Oct/22

$N u m b e r o f 4 d i g i t e d n u m b e r s$ $w i t h d i s t i n c t d i g i t s . . . a r e d i v i s i b l e$ $b y 9 . . i g o t 516 . . . i g o t c o n f u s i o n$ $k i d l y h e l p m e$
Commented by mr W last updated on 29/Oct/22

$516 i s c o r r e c t .$ $(3 + 11 + \frac{3}{4} \times 10) \times 4! = 516$
Commented by SLVR last updated on 02/Nov/22

$S o g r e a t p r o f . W . h e r e i d i d a s$ $m i n s u m i s 9 m a x i m u m s u m$ $27 . T h e n w r i t i n g a l l p o s s i b i l i t i e s$ $0 i n c l u s i o n o r e x c l u s i o n i n e a c h c a s e$ $b i t l e n g t h y i n t i m e a n d$ $c a l i c u l a t i o n . . k i d l y t e l l m e h o w$ $f o r m a t i n a l i n e ? p l e a s e$
Commented by SLVR last updated on 02/Nov/22

$i f e e l p r o u d a n d l u c k y w i t h$ $y o u r a s s o c i a t i o n . . i n e e d a p h o t o$ $o f y o u . . a s m e, m y s t u d e n t s w e r e$ $w a i t i n g t o s e e y o u . . t h a n k s a l o t$
Commented by SLVR last updated on 03/Nov/22

$S i r . . i r e q u e s t y o u h o w a b o v e$ $w a s f o r m u l a e w a s m a d e o f . .$ $k i n d l y e x p l a i n p l e a s e$
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