How-many-positive-integers-less-than-500-can-be-formed-using-the-numbers-1-2-3-and-5-for-the-digits-

Question Number 162942 by HongKing last updated on 02/Jan/22

How many positive integers less than

500 can be formed using the numbers

1, 2, 3 and 5 for the digits ?

Answered by som(math1967) last updated on 02/Jan/22

3 d i g i t s t a r t i n g w i t h 1, 2, 3 = 4^{2} \times 3

2 d i g i t = 4^{2} u n i t d i g i t = 4

t o t a l = 48 + 16 + 4 = 68

Answered by peter frank last updated on 02/Jan/22

with repetition or without repetition ?

Commented by som(math1967) last updated on 02/Jan/22

w i t h r e p e t i t i o n