+118723 @@ End of Day Wrap Tues 7/4/15 Sydney, Australia Time 12:06am (Really Wed morn) ♪ ♫
Hi all,
Great answers today from MathsGod1, CPhill, Garmoon, asbooooo, sadpumpkin (don't be sad), Pyramid, Alan, Geno3141 and JohnJohn. Thanks all 
Interest Posts:
FTJ means "For the Juniors"
1) A bit of monkey business Thanks CPhill and Alan
2) A bit of fun - but is it true? :) Melody
3) Factorizing sum of 2 cubes Thanks CPhill and Melody
4) Basic probablility (suitable for middle high) Thanks CPhill
5) Probability and ratios Thanks CPhill and Melody
6) What is the factorial of a decimal Thanks Geno and Melody
7) Trig - be careful with those neg signs. Thanks Alan
8) What is nCr and nPr ? Melody
9) Fibonacci sequence as a formula Thanks Geno
10) Interior angle sum of a hexagon FTJ Melody
11) Angular and linear velocities Thanks CPhill
♫♪ ♪ ♫ ♬ ♬ MELODY ♬ ♬ ♫♪ ♪ ♫
+118723 Wed 8/4/15
FTJ means "For the Juniors"
1) Solving quadratic inequalities Thanks CPhill
2) Finding the constant of variation Melody
3) Rationalizing the denominator Melody
4) Solving Trig equations Thanks CPhill
5) Function Notation FTJ Thanks CPhill
6) A good volume question Thanks Alan
7) Functions and their graphs Thanks CPhill, Alan and Melody
8) Scientific notation and significant figures FTJ Thanks anon and Melody
9) Counting again. I must have tooo much time one my hands LOL
10) Trig identity proof Not answered.
♫♪ ♪ ♫ ♬ ♬ MELODY ♬ ♬ ♫♪ ♪ ♫
+118723 P stands for permutations and C stands for combinations.
Here is a introductory video clip on combinations and permutation.
https://www.youtube.com/watch?v=hJRXKq2GEo8
3C2 means how many combinations of 2 can you get from 3 objects I'll call them A,B,C
Well you can get AB, AC, or BC so 3C2=3
3P2 means how many permutations of 2 can you get from the 3 objects
Well with permutations order counts so you can have
AB or BA, AC or CA, BC or CB SO 3P2=6
nCr means how many combinations of r objects can you take from n objects.
nPr means how many permutations of r objects can you take from n objects. 
