Variable Ratio Schedule

Pennypacker's Pedants presents:

Variable ratio schedule of reinforcement defined.

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Discussion is encouraged and we might even jump in from time to time. Civility and respect are required, blatant and dogmatic agreement is not. However, if your comments are out of line, we will delete them.
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[guadalupeescobedo]

so if it's VR2 what does the "2" mean if you have 10 trials? I am still confused a bit when I see if written out like VR2, VR3, VR5, etc