If n is a natural number, then (6n2 + 6n) is always divisible by:

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OPSC ASO (Maths & Reasoning) 27 Aug 2022 Official Paper
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  1. 6 only
  2. 6 and 12 only
  3. 12 only
  4. 18 only

Answer (Detailed Solution Below)

Option 1 : 6 only
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Detailed Solution

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Given:

The expression is 6n² + 6n, where n is a natural number.

Formula used:

Factorize the expression to check for divisibility:

6n² + 6n = 6n(n + 1)

Calculations:

The expression 6n(n + 1) represents the product of 6, n, and (n + 1). Since n and (n + 1) are two consecutive integers, one of them will always be divisible by 2, making their product divisible by 2. Additionally, the 6 in the expression ensures that the entire product is divisible by 6.

∴ 6n² + 6n is always divisible by 6.

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