There are 40 volunteers for the research study on the power pill. each subgroup of the study will contain 10 participants. determine how many ways these participants can be selected and explain your method.

To form first group of 10 participants you have ways. After that only 30 volunteers left and to form second group of 10 participants you have ways. After forming second group 20 volunteers left and to form third group of 10 participants you have ways. At last, 10 volunteers left and to form fourth group of 10 participants you have ways.

Use product rule to count the total number of possible ways:

answer: the area of the parallelogram below is 42 square meters.

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