Question

Explain The Factorial '!'.​

Answer 1

Step-by-step explanation:

if you are writing

1! then it means 1

2!=1×2

3!=1×2×3

4!=1×2×3×4

similarly,

5!=1×2×3×4×5

Answer 2

Answer:

factorial can be defined as product of consecutive integers in a decreasing order from n to 0

5! =5 x 4 x 3 x 2 X 1

6!= 6 x 5 x 4 x 3 x 2 X 1

(note 0! is equal to 1 because if 0! =0 then many real life situations will fail ) because factorial is used in permutation and combination and to show its importance that 0 factorial is equal to 1 let us assume that there are 5 persons and 5 seats and number of ways in which 5 person can sit is 5 factorial and you can see if 0! =0 then number of ways in which these 5 person can sit will become zero which is impossible that's why we take 0 factorial is equal to 1