IQ test
1+5::[6]
2+5::[13]
3+5::[21]
4+5::[?]
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Answer: 1 + 5 = 6
2 + 5 = 13
13 - 6 = 7
2 + 5 = 13
3 + 5 = 21
21 - 13 = 8
3 + 5 = 21
4 + 5 = x
x - 21 = 9
9 + 21 = 30
Thus, 4 + 5 = 30
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