Question

find out the LCM of 9, 21, 28 ​

Answer 1

Answer:

252

Step-by-step explanation:

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Answer 2

To find : LCM of $9,21,28$

Solution :

• To find the LCM of $9,21,28$.

• We find prime factors of $9,21,28$ .

• Prime factors of $9=3 \times 3$

• Prime factors of $21 = 3\times 7$

• Prime factors of $28= 2\times 2\times 7$

•  LCM $= 2\times 2\times 3\times 3\times 7$

                $= 252$

Hence , LCM of $9,21,28$ is $252$ .