In the fifth

In the fifth grade, which is attended by 88 pupils, two elective subjects are taught: mathematics exercises and sports games. 66 pupils did not attend mathematics exercises, which is 3 more than the number of pupils who did not sign up for sports games. 9 pupils signed up for both. a) How many pupils signed up for at least one elective subject? b) How many pupils signed up for exactly one elective subject?

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