In this case, all letters are unique.
Start by holding the first letter:
E - XAM
E - XMA
E - MAX
E - MXA
E - AXM
E - AMX
So there are 6 combinations here.
Repeat for all 4 letters.
6 x 4 = 24
This is same as 4x3x2x1.
For 3 unique characters, it is 3x2x1.
For 5 unique characters, it is 5x4x3x2x1
And so on...
55/20=2 as qutiont and 15 as remainder
2X84=168
15X5=75
answer=243
Change the order of integration.

Substitute
and
.

2x +8=2x+8
2x-2x=8-8
0x=0
So the answer is 0
Answer:
3(p+4m) + 8
Step-by-step explanation:
Factor out a 3 for the first two terms, 3(p+4m) and add 8 like usual