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

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 \dots a r e d i v i s i b l e

b y 9 . . i g o t 516 \dots 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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