Question

What is the value of the following sum:

1!+2!+3!+4!+5!?

Answer 1

Details and assumptions
The number n!, read as n factorial, is equal to the product of all positive integers less than or equal to n. For example, 7!=7×6×5×4×3×2×1.

Answer 2

1+2*1+3*2+4*3*2+5*4*3*2

Answer 3

sorry it is not the correct answer

Answer 4

What is the problem you are facing in it??

Answer 5

i dont understand your question

Answer 6

153

Answer 7

Don't tell the answer directly, @SerikMB let him or her solve first..

Answer 8

factorial n!=n*(n-1)*(n-2)*(n-3)... till n-x=1 ok?

Answer 9

hey thanks i had made a mistake. sorry

Answer 10

@waterineyes, i have shown it before, probably he got confused by addition

Answer 11

\[1! = 1, \quad 2! = 2 \times 1 = 1, \quad 3! = 3 \times 2 \times 1 = 6\]
\[4! = 4 \times 3 \times 2 \times 1 = 24, \quad 5! = 5 \times 4 \times 3 \times 2 \times 1 = 120\]

Now just add them..

Answer 12

1+2+6+24+120=153

Answer 13

\[2! = 2 \times 1 = 2\]