Question

(a) The factors of 21 are 1, 3, 7 and 21​

Answer 1

The factors of 21 will be 1, 3 and 7.

Step 1: First we write down the number 21.

Step 2: We find the two numbers, whose product will be 21 under the multiplication, say 3 and 7,

such that 3 × 7 = 21 and 7 ×3=21

Step 3: Now we know that 3 and 7 are prime numbers which means they are only two factors, i.e., one and the number itself.

The factors of 3 will be = 3 × 1

The factors of 7 will be = 7 x 1

So, we cannot factorize them further.

Step 4: Therefore, the factorization of 21 can be written as 21 = 3 × 7 × 1

To find more such factors: https://brainly.in/question/49509601