belongs to an infinite number of sets.
For example, the Real Numbers, the Rational Numbers, Integers, negative integers, odd negative integers, negative primes numbers, the set {12, -17, 98} or {2.76, pi, -17, k, wikianswers}. In fact any collection, however random, of numbers or other things, that includes -17.
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There are an infinite number of sets of numbers. 9,10 an 11 9,9,10,11 and 11 9,9,9,10,11,11 and 11 etc, for example, is one family of sets of numbers.
To any set that contains it! It belongs to {-8}, or {-8, sqrt(2), pi, -3/7, 99.3}, or all whole numbers between -43 and 53, or multiples of 2, or integers, or rational numbers, or real numbers, or complex numbers, or square roots of 64 or fourth roots of 4096 etc.
{141, 444}, {232, 353} are two possible sets.
It belongs to an infinite number of sets.For example the sets of:rational numberspositive numbersnumbers between 4 and 5numbers between 4 and 6numbers between 3 and 7numbers ending in ".8"numbers appearing in questions on WikiAnswersnumbers contained in your homework problemsnumbers less than 100the numbers {1.3, 4.8, 13.7}and so on.
There are no three-digit numbers that equal 17. In fact, there are no numbers with more or less than two digits that equal 17. In fact, in the whole infinite supply of numbers, there is only one single number that equals 17. That number is . . . . . . . 17 .