Video Transcript
𝑌 is the set of digits in the
number 90,590. Write 𝑌 using the listing
method.
Well, the first thing we need to do
in this question, to enable us to write 𝑌 using the listing method, is identify the
digits within our number. Well, first of all, we can see that
the digit nine appears twice. Then we have the digit zero, which
also appears twice, and finally the digit five. Now, when we’re gonna list these
digits, so we’re gonna list the set of digits, which is 𝑌, we only need to list
each digit once. So therefore, the set 𝑌 would
equal nine, five, and zero. And it’s worth noting here that a
common mistake would be to list all of the digits that we have, for instance, two
nines, two zeros, and a five. So, It’s also worth noting that it
doesn’t matter which order we put them in. I’ve just put them here in
descending order.
