Answer:
The correct answer is first option 13C₅ = 1287
Step-by-step explanation:
Formula:-
nCr = (n!)/r!(n - r)!
To find the value of 8=13C₅
By the formula we can write,
13C5 = 13!/5!(13 - 5)!
= 13!/5!8!
= (13 * 12 * 11 * 10 * 9 *8!)5!8!
= 13 * 12 * 11 * 10 * 9 )/(1 * 2 * 3 * 4 * 5)
= 1287
Therefore the correct answer is first option 13C₅ = 1287
