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Answer to Q79
[6, 7, 11, 20] [5, 3, 2] [x, 4] [10]. What is x?
Let's rewrite the series like this:
[A, B, C, D] [E, F, G] [H, I] [J]
Then:
E, A, B
F, B, C
G, C, D
H, E, F
I, F, G
J, H, I
all forms sub - series.
Let's test the theory,
5, 6, 7 that's a series with difference of 1
3, 7, 11 that's a series with difference of 4
2, 11, 20 that's a series with difference of 9
x, 5, 3 (5 and 3 has a difference of 2 so x should be 5 + 2 = 7)
4, 3, 2 that's a series with difference of -1
10, x, 4 (10 - 4 is 6 so the difference here can only be 6 ÷ 2 = 3) so series becomes 10, 7, 4. x was also 7 in our x, 5, 3 which means we are correct.
Answer: 7
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