SOLUTION: How many positive integers less than 1000 a) have exactly three decimal digits? b) have an odd number of decimal digits? c) have at least one decimal digit equal to 9? d) have

Question 1100927: How many positive integers less than 1000
a) have exactly three decimal digits?
b) have an odd number of decimal digits?
c) have at least one decimal digit equal to 9?
d) have no odd decimal digits?
e) have two consecutive decimal digits equal to 5?
f ) are palindromes (that is, read the same forward and backward)?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
There's no algebraic solution for these.
It's just "figure it out."
----------
You do it.
PS There's nothing to be learned from it. It's a waste of time.
RELATED QUESTIONS
How many positive integers are less than 100 and have an odd number of factors? (answered by richard1234)

a) How many seven-digit telephone numbers have one digit which is a multiple of 4 and six (answered by ikleyn)

How many positive integers less than 600 have digits that are all... (answered by Alan3354)

How many positive even integers of three different digits each are less than... (answered by Alan3354)

How many three-digit counting numbers less than 500 have digits that are all... (answered by Boreal,ikleyn)

Consider the integers from 1,000 to 9,999 which have only odd digits. a. How many of... (answered by ikleyn)

How many positive integers are there less than 800 such that all the digits are... (answered by drcole)

How many positive integers are there less than 900 such that all digits are... (answered by macston)

How many positive integers less than 150 are there such that all of the digits are... (answered by solver91311)