Composite numbers and
prime factors
Which set is not made up only of prime
numbers? Circle the correct answer.
a {1, 2, 3, 5, 7, 11, 13, 17.}
b {13, 17, 19, 23, 29, 31, 37, 41.}
c{17, 19, 23, 29, 31, 37, 41, 43.}
d {31, 37, 41, 43, 47, 53, 59, 61, 67.}
nr circle the correct answers.

a {1, 2, 3, 5, 7, 11, 13, 17.}

Step-by-step explanation:

Number one is not a prime number.

Indeed, the definition of a prime number is to be divisible by two distinct integers, 1 and itself. Concerning the number 1, the two divisors 1 and itself are not distinct: they are equal. Therefore, 1 does not match the definition of a prime number, and therefore is not a prime number!

a

Step-by-step explanation:

1 is not a prime number

x = 23.78

step-by-step explanation:

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.