because in X, the difference from 4 to 6 is 2, the difference from 6 to 10 is 4, the difference from 10 to 12 is 2
so n = 3
in Y, 1 to 9 is 8, 21 to 25 is 4.
9 + 6 is 15
Answer from: Quest
Bis the right answer
Answer from: Quest
is only a line? i think so
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