Quantitative Aptitude Number System LCM and HCF

A and B (A > B) are two numbers in such a way that (A/17) + (B/17) is a prime number less than 10 and their difference is a perfect square. If their HCF is 7 and their sum is an odd number, then what is the LCM of A and B?

1

420

2

480

3

460

4

540

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