target
#4 : level 1.5 question, not hard at all.
#5: number theory, learn mod or remainder (pattern)
# 6 and #8
Good for AMC/ AIME preps as well.
team notes :
#1: easy, just one line
#2: symmetry and infinite geometric sequence
#3: mental math
#4: more tedious, remainders (take more time)
#5: there is a very fast method
#6: elementary
#7: use balanced method (similar to mass point)
easy to make sillies
if your answer is 82, not "84".
CAREFUL ! !
#8 : two methods
#9 : You need to practice and see if you can solve it at a
timely manner,
even if you have the right idea (for AMC
as well)
#10: more ambiguous question, harder to tell if you are
"Really" right.
