Campus Maths Puzzle Numerical Ability Permutation and Combination

consider the letters of the word ASSAASSINATION.how many different four letter words can be formed?
1.916
2.72
3.917
4.807
5.none

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Campus Other Question

XYY+XZ=ABCX
XYY-XZ=DYX
find the digit D
if 9+3-5 =32 ,11+6-4=70,then 18+2-4=?