Simple math: Take pictures of five volunteers and two old people they helped. - Training Enrollment Network

Simple math: Take pictures of five volunteers and two old people they helped.

First, tie up two old people and turn them into six people to take pictures.

The total combination is ***6! =720 species.

Subtract two old people from both ends, ***2*5! =240 species

720-240=480 species.

Then the two old people can swap places.

The final result is 480*2=960 species.

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