- #1
chickenguy
- 16
- 0
more questions?
Hi more questions again... i am having a hard time figuring out these questions...
1)a)how many 6-digit palindromic numbers are there?
(i can do this the slow way, but i am looking for shortcuts)
b) how many odd 7-difit palindromic numbers are there in which every digit appears at most twice?
( again, i am looking for a fast way)
2)show that if 14 distinct intergers are chosen form the sequence 100, 101,102, 103...,123,124, there must be two of them whose difference is 4
(i have worked this out by writing out 14 numbers and having all the possibilities(it took a long time) and i am looking for a shortcut)
Hi more questions again... i am having a hard time figuring out these questions...
1)a)how many 6-digit palindromic numbers are there?
(i can do this the slow way, but i am looking for shortcuts)
b) how many odd 7-difit palindromic numbers are there in which every digit appears at most twice?
( again, i am looking for a fast way)
2)show that if 14 distinct intergers are chosen form the sequence 100, 101,102, 103...,123,124, there must be two of them whose difference is 4
(i have worked this out by writing out 14 numbers and having all the possibilities(it took a long time) and i am looking for a shortcut)