here order of the vowels remains unaltered means order of vowel doesnot take place ,In  VENUS  , E is on the second position and U is on fourth position , so order of vowels are  2 and  4 ..

for solving the question . we arrange only V, N, S.

So, 

Ans :-  ³P₃ = 6 .

is it clear now.then rate me.