Question: We are designing a study in which six external electrodes will be implanted in a rats brain. The six-channel amplifier in our recording apparatus blew

We are designing a study in which six external electrodes will be implanted in a rat’s brain.

The six-channel amplifier in our recording apparatus blew two channels when the research assistant took it home to run her stereo. How many different ways can we record from the brain? (It makes no difference what signal goes on which channel.)

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