1
visibility
1 -3 -7 -11 -15 ….
-
-25
-
-19
-
-18
-
-15
เฉลย -19
อธิบาย ใช้ระบบ +1 แล้ว -5
1 + 1 = 2 2 – 5 = -3
-3 + 1 = -2 -2 – 5 = -7
-7 + 1 = -6 -6 – 5 = - 11
-11 + 1 = -10 -10 – 5 = -15
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