p, q, r are three numbers such that the LCM of p and q is q and the LCM of q and r is r. The LCM of p, q and r will be

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Assam ADRE SLRC 2022 Paper IV
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  1. q
  2. r
  3. qr
  4. pqr

Answer (Detailed Solution Below)

Option 2 : r
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SS History: Ancient Indian History/প্ৰাচীন ভাৰতীয় ইতিহাস
10 Qs. 10 Marks 10 Mins

Detailed Solution

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Given:

p, q, r are three numbers such that:

LCM(p, q) = q

LCM(q, r) = r

Formula used:

LCM of multiple numbers is the smallest number divisible by all.

Calculation:

From the conditions:

⇒ LCM(p, q) = q implies p is a factor of q.

⇒ LCM(q, r) = r implies q is a factor of r.

⇒ Therefore, p is a factor of q, and q is a factor of r. Hence, p is also a factor of r.

⇒ The LCM of p, q, and r will be the largest number, which is r.

The correct answer is option (2).

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