Suppose That a "Word" Is Any String of Seven Letters

question 58

Short Answer

suppose that a "word" is any string of seven letters of the alphabet, with repeated letters allowed.
-How many words begin with A or B and end with A or B?

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Definitions:

Gate-Control Theory

The gate-control theory is a scientific theory proposing that the spinal cord contains a neurological "gate" that either blocks pain signals or allows them to continue to the brain.

Sensory Nerves

Nerves that transmit sensory information from the body's periphery to the central nervous system for processing.

Free Nerve Ending

Sensory receptors found throughout the body that respond to pain, temperature, and touch.

Odorant Molecules

Chemical particles capable of being detected by the sensory neurons in the nose, leading to the perception of smell.