loganr

p.607
19.how many 3 digit palindrome are there.

19
20
100
810
how did u find it

theoneo

The first and third number are the same, and the second one can be anything.

The only constraint on the first/third number is that it cannot be equal to zero, or else it would not be a three digit number. So there are 9 possibilities (1 through 9).

There are no constraints on the second number. So there are 10 possibilities.

How many combinations are there? 9 x 10 = 90. The answer is C.

xiggi

You forgot to list THE answer that is 90.

How many numbers can be "in the middle" of three digits palindrome?
Everyone of 0 to 9 ... so that is 10 numbers.

How many can be on the sides?
O is not possible -it would become a single digit number-
That leaves us 9 combinations (1x1, 2x2, 3x3, etc.)

So the answer is 9 times 10 or 90.

PS This way you have 111, 121, 131, 141, all the way to 999.

Mackie45

wow, i am soo lost. lol. What is a palindrome? and is that going to be on Sat I or SAT II?

beginning

Your dictionary can answer the question for you. If you don't know how to use one, you're going to have definite problems with the SAT.