# Two sets

Suppose Set B contains 69 elements and the total number elements in either Set A or Set B is 124. If the Sets A and B have 29 elements in common, how many elements are contained in set A?

Result

A =  55

#### Solution:

$B = 69 \ \\ AB = A\cap B \ \\ AB = 29 \ \\ B_{ 1 } = B - AB = 69 - 29 = 40 \ \\ T = 124 \ \\ \ \\ A = T - AB - B_{ 1 } = 124 - 29 - 40 = 55$ Our examples were largely sent or created by pupils and students themselves. Therefore, we would be pleased if you could send us any errors you found, spelling mistakes, or rephasing the example. Thank you!

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