Joshua W. answered • 01/07/15

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1. I answered this one in a previous question so check that answer for an detailed explanation. Briefly, you are adding the previous two digits to get the next digit so the sequence is 2,2,4,6,10,16,26,42

2. Here, instead of adding the previous two digits to get the next digit, you are subtracting the previous two digits to get the next digit (that is the rule)

so 3-4=-1

4--1=5

-1-5=-6

5--6=11

-6-11=-17

11--17=28

3. Same as the sequence in #1. Just add consecutive digits to get the next digit. So the next digit is 28+46=74 and the next is 46+74=120 and the next is 74+120=194