Find the odd man out in aptitude questions for interview

Find the odd man out in aptitude questions for interview

1. 3,5,7,12,13,17,19

    Answer : 12 

    Explanation : All but 12 are odd numbers

2. 2,5,10,17,26,37,50,64

   Answer : 64

   Explanation : 2+3=5; 5+5=10; 10+7=17; 17+9=26; 26+11=37; 37+13=50; 

   50+15=65;

3. 105,85,60,30,0,-45,-90

    Answer : 0

    Explanation : 105-20=85; 85-25=60; 60-30=30; 30-35=-5; -5-40=-45; -45-45=-90;