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jadi suku ke 25 adalah 25² + 1 = 625 + 1 = 626
semoga membantu
2, 5, 10, 17
+3 +5 +7
+2 +2
2a = 2 3a + b = 3 a + b + c = 2
a = 1 3 + b = 3 1 + 0 + c = 2
b = 0 c = 1
Un = an² + bn + c
= n² + 1
U25 = 25² + 1 = 626