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Roster method: A={1,2,3,4,5,6,7,8}
Rule mathod: A={ ✖️.✖️ is a 1-8}
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What is a whole number less than 40?
All positive integers less than or equal to 39 are whole numbers less than 40.
How many positive integers less than 100 have the sum of their digits equal to a perfect square?
There are 20.
What positive integer less than -6?
There are no positive integers less than any negative ones.
How many positive integers less than 20 are equal to the sum of a positive multiple of 3 and 4?
Two of them. Two of them. Two of them. Two of them.
What is the Positive integers less than 4?
3, 2, 1
How many positive integers less than or equal to 100 have a prime factor that is greater than 4?
There are 80 such integers.
What is a whole number less than 40?
All positive integers less than or equal to 39 are whole numbers less than 40.
What are the positive integers less than or equal to 11?
1,2,3,4,5,6,7,8,9,10 and 11 Integers are the whole numbers such as one, two, thirteen, a million, etc. I listed the ones which are positive - grater than zero - and smaller than or equal to eleven
Which has more elements the set of positive odd integers less than 50 or the set of positive even integers less than 50?
The set of positive odd integers.
What is the sum of all positive integers less than 100 that have the product of their digits equal to 4?
81
How many positive integers less than 100 have the sum of their digits equal to a perfect square?
There are 20.
How many positive integers less than 60 are equal to the product of a positive multiple of 5 and an even number?
Five of them.
What is the sum of the first positive odd integers less than 101?
The sum of the first positive odd integers less than 101 is 10,000.
What positive integer less than -6?
There are no positive integers less than any negative ones.
What is a positive integer and what is a negtive integer?
Positive integers are greater than zero. Negative integers are less than zero.
How many positive integers less than 20 are equal to the sum of a positive multiple of 3 and 4?
Two of them. Two of them. Two of them. Two of them.
How many positive integers less than 2010 have an odd number of factors?
There are 44 positive integers less than 2,010 that have an odd number of factors.
