1A. IN 123456789
OUT 937557391
1B. IN 123456789
OUT 335443554
1C. IN 123456789
OUT OTTFFSSEN
1D. IN 123456789
OUT UDTQCSSHN
2A. 3, 5, 7, 9, 11, 13, 15, 17, 19, ?
2B. 3, 5, 7, 11, 13, 17, 19, ?
2C. 2, 5, 10, 17, 26, 37, 50, 65, 82, ?
2D. 1, 2, 4, 8, 16, 32, 64, 128, ?
2E. 1, 1, 2, 3, 5, 7, 12, 19, 27, ?
Source: The Math League
http://www.mathleague.com
4A. Middle School - Seating Dilemma
4B. Elementary School - Across the Netherlands
Source: The Math Forum
4A.
http://forum.swarthmore.edu/midpow/solutions/solution.ehtml?puzzle=68
4B.
http://forum.swarthmore.edu/elempow/solutions/solution.ehtml?puzzle=64
Don Braffitt