Math logic
There are 20 children in the group, each two children have a different name. Alena and John are among them. How many ways can we choose 8 children to be among the selected
A) was John
B) was John and Alena
C) at least one was Alena, John
D) maximum one was Alena, John?
Correct result:
A) was John
B) was John and Alena
C) at least one was Alena, John
D) maximum one was Alena, John?
Correct result:

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