Question

complete the number triad
12 20 28 21 19 ? 31 21 11
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Answer 1

Answer:

a) After 19 -> 27. b) After 11 -> 1.

Step-by-step explanation:

a) They are continually adding by 8. See, you can see a +8 difference in each one. For shorter use, you could take the second number in the list (20) and minus from the first (12) to see the difference. in this case, it's (8).

The same happens for every 2 random pairs in that same "number triad".

b) See how they're constantly losing 10? That came straight to mind when I saw it, but in more complicated matters when it's harder, do the same method: Minus the second number (21) from the first (31). 21 - 31 = -10.

So they are constantly going -10, -10, -10. So to find the answer, take the last one in the array, or as you call it, "number triad", and take away 10. 11 - 10 = 1.

Hope this helps! ^^