13C3: 13 choose 3 work with steps provide the detailed information about what is the total number of possible combinations occur (nCk) while choosing 3 elements at a time from 8 distinct elements without considering the order of elements.
nCk of 13C3:
13 CHOOSE 3 = 286
where,
13 is the total number of distinct elements (n),
3 is the the number of elements drawn or choosen at a time (k),
286 is the total number of possible combination (C).
13C3 Points to Remember:
13C3 is the type of nCr or nCk problem. The below 13 choose 3 work with steps help users to understand the combinations nCk formula, input parameters and how to find how many possible combinations/events occur while drawing 3 elements at a time from 13 distinct elements without considering the order of elements.
Solved Example: :
what is 13 choose 3?
step 1 Address the input parameters and observe what to be found:
Input values:
Total number of distinct elements (n) = 13
The number of elements drawn at a time (k) = 3
What to be found:
Find the total number of possible combinations while choosing 3 elements at a time from 13 distinct elements without considering the order of elements.
step 2 Find the factorial of 13:
13! = 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 x 11 x 12 x 13
step 3 Find the factorial of 3:
3! = 1 x 2 x 3
step 4 Find the factorial of difference between 13 and 3:
(13 - 3)! = 10!
10! = 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10
step 5 Apply the values of 13!, 3! and 10! in the nCk formula:
nCk = n!/k! (n - k)!
13C3 =13!/3! x 10!
=1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 x 11 x 12 x 13/(1 x 2 x 3) x (1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10)
step 6 Simplify the above 13C3 equation:
=1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 x 11 x 12 x 13/(1 x 2 x 3) x (1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10)
= 11 x 12 x 13/6
= 1716/6
13C3 = 286
Hence,
13 choose 3 equals to 286