Question

In which of the following expressions prime factorisation has been done ? a) 15 = 1 x 3 x 5 b) 24 = 2 x 3 x 4 c) 36 = 2 x 3 x 6 d) 30 = 2 x 3 x 5

Answer 1

Answer: Option d

Step-by-step explanation:

Option a : it cannot be written as 1 x 3 x 5, it has to be written as 3 x 5 as 1 is neither a prime nor a composite number.

Option b : it has to be written as 2 x 3 x 2 x 2.

Option c : it has to be written as 2 x 3 x 2 x 3.

Option d : all the numbers are prime numbers, so therefore option d is the right answer