7. In 2015, December 25 fell on a Friday. On what day of the week does Christmas fall in 2025? 8. Handshake problem: In a class of 24 students, the teacher asked everyone to shake hands and introduce each other. How many handshakes were exchanged? Find a formula for n students. Who can solve my puzzle? 9. The McDonalds Math Problem: |=30 O =20 =? OPiaBownloadzcom

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