If 'a' is a natural number, then (9a2 +

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Algebra

Question:

If 'a' is a natural number, then (9a² + 9a) is always divisible by?

Options:

9 only

18 only

9 and 18

Correct Answer:

9 and 18

Explanation:

Put a = 1 (as 1 is a natural number)

9 × 1² + 9 × 1 = 18 which is divisible by option 3 (9 and 18, both)