Answer :

mhanifa

Answer:

  • 5 numbers

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Only the perfect squares have odd number of factors.

Example

  • 1 ⇒ 1                            One factor
  • 4 ⇒ 1, 2, 4                   Three factors
  • 16 ⇒ 1, 2, 4, 8, 16        Five factors

Perfect squares less than 30 are

  • 1, 4, 9, 16, 25 - total 5 numbers

Solution:

Find the set of prime numbers that, when multiplied together, give 30.

2,3 and 5

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