The difference between 2 and 9 is 7. The difference between 9 and 5 is 4. So 2+7=9. 9-4=5. 5+8=13. 13-3=10. 10+9=19. 19-2=17. This means that the next number would be 27, as 17+10=27. Notice the pattern?
This ones pretty easy. I put some #s in bold to make them clear
+7 -4 +8 -3 +9 -2 the next is +10
17+10=27
Its 27
27
The number which best completes the sequence below is:2 9 5 13 10 19 17?
The number which best completes the sequence below is: 2 9 5 13 10 19 17 ?
The number which best completes the sequence below is:1 1 3 2 4 6 5 25 ?
We can't answer this accurately without knowing the sequence.
7
77040
== ==
27. But that continues the sequence, it does not complete it.
The number which best completes the sequence below is 20 5 30 6 42 7
27
25
It is: 10-3 = 7