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Worksheet: Subsets of Natural Numbers

Q1:

Find { 3 , 1 0 , 1 , 4 } where is the set of prime numbers.

  • A
  • B
  • C
  • D { 3 }
  • E { 1 , 3 }

Q2:

Find 𝑋 𝑌 where 𝑋 = { 𝑛 𝑛 is odd number less than 9 } and 𝑌 = { 𝑛 𝑛 is a prime number less than 10 } .

  • A { 1 , 3 , 5 , 7 }
  • B { 3 , 5 , 7 }
  • C { 2 , 3 , 5 , 7 }
  • D { 1 , 2 , 3 , 5 , 7 }

Q3:

What is a prime number?

  • A a number that has one factor repeated
  • B a number with more than two factors
  • C a number with exactly two factors, 0 and itself
  • D a number with exactly two factors, 1 and itself
  • Ea number with exactly three factors, one factor is repeated and the other two are 1 and itself

Q4:

Find 𝑋 𝑌 given 𝑋 = { 𝑛 𝑛 is an odd number that is less than 10 } and 𝑌 = { 𝑛 𝑛 is a prime number that is less than 11 } .

  • A { 1 , 9 , 3 , 5 , 7 }
  • B { 1 , 2 , 3 , 5 , 7 , 9 }
  • C { 2 , 3 , 5 , 7 }
  • D { 3 , 5 , 7 }

Q5:

Find where is the set of odd numbers.

  • A
  • B
  • C
  • D
  • E

Q6:

Is { 8 , 5 } { 1 , 6 } , , or ?

  • A
  • B