Consecutively numbers

How many ways are there to arrange the numbers 3, 2, 15, 8, and 6 so that the even numbers are arranged in ascending order (not necessarily consecutively)?

Correct answer:

n =  20

Step-by-step explanation:

2<6<8 X,Y  { 3, 15 }  X Y 2 6 8 X 2 Y 6 8 X 2 6 Y 8 X 2 6 8 Y  2 X Y 6 8 2 X 6 Y 8 2 X 6 8 Y  2 6 X Y 8 2 6 X 8 Y  2 6 8 X Y  n=2 (4+3+2+1)=20



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