Question

Evaluate 10^C6 and 4^P3

Answer 1

Answers

Part 1: 210

Part 2: 24

Explanation

Part 1

This is called combination. 

ⁿCm means, the number of different combinations of m objects out of n objects. 

¹⁰C₆ = 10!/10!(10-6)!

        = 10!/(6!×4!)

        =210

Part 2

This is called permutation.

If you have nPm, this means the number of permutations of m objects out of n.

It's solve as follows;

nPm = n!/(n-m)!

⁴P₃ =4!/(4-3)!

      = 4!/1!

       = 24

Answer 2

$\bf \stackrel{combination}{_nC_r=\cfrac{n!}{r!(n-r)!}\qquad\qquad \qquad\qquad \qquad _{10}C_6=\cfrac{10!}{6!(10-6)!}} \\\\\\ \stackrel{permutation}{_nP_r=\cfrac{n!}{(n-r)!}\qquad\qquad \qquad\qquad \qquad _4P_3=\cfrac{4!}{(4-3)!}}$

yes, check your calculator for the [ ! ] factorial button.

one note that your calculator also has a [ ₙCᵣ ] and [ ₙPᵣ ] buttons for combinations and permutations.