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n = mulai bilangan 1 sampai tak terhingga
n = ? (bilangan genap × n²)
n = 1 (2 × 1²) ⇒ 2 × 1 = 2
n = 2 (4 × 2²) ⇒ 4 × 4 = 16
jadi,misal a genap maka a² juga genap.contoh :
a = 2
a² = 2×2 = 4