medium · GMAT Quant
A laboratory shelf holds soil samples labeled with the integers from 1 to 51, one sample for each integer. Exactly two of the samples will be selected, and the order of selection does not matter.
How many of the possible groups of two samples are such that at least one of their numbers is a multiple of 5?
- 45
- 410
- 455
- 910
- 1,230
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