The sum of two numbers a and b is 280. Their L.C.M is thrice their H.C.F. If b = ar (r is an integer….

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The sum of two numbers a and b is 280. Their L.C.M is thrice their H.C.F. If b = ar (r is an integer), what is the difference between the numbers?

Options :-

1. 70
2. 140
3. 210
4. 280
5. 350

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