Question-207179

Question Number 207179 by efronzo1 last updated on 08/May/24

Answered by mr W last updated on 08/May/24

3 \times 4 \times 3 \times 2 = 72 s u c h n u m b e r s

Commented by efronzo1 last updated on 09/May/24

\underset{⏟}{B} \underset{⏟}{}

Commented by mr W last updated on 09/May/24

n o s i r!

t o s e l e c t t h e l a s t d i g i t t h e r e a r e 3

p o s s i b i l i t i e s (1, 3, 5) . f o r t h e

r e m a i n i n g 4 d i g i t s t h e r e a r e 4 \times 3 \times 2 \times 1

p o s s i b i l i t i e s . s o t o t a l l y t h e r e a r e

3 \times 4 \times 3 \times 2 \times 1 = 72 n u m b e r s i f

n o r e p e t i t i o n i s a l l o w e d .

Answered by som(math1967) last updated on 08/May/24

5^{4} \times 3, i f r e p e t i t i o n i s a l l o w e d

Commented by som(math1967) last updated on 09/May/24

I f r e p e t i t i o n n o t a l l o w

◼ ◼ ◼ ◼ 1 o r 3 o r 5

P_{4}^{4} \times 3 = 4! \times 3 = 72