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Verified answer
U1 = a = 2b = U2 - U1
b = 2
Un = a + (n-1)b... (aritmatika)
Un = 2 + (n-1)(2)
Un = 2 + 2n - 2
Un = 2n
Un = 2n = 50
n = 25
Sn = ½n (U1 + Un)
S25 = ½ × 25 × (2+50)
S25 = ½ × 25 × 52
S25 = 650
Jadi hasil dari 2+6+8+10+...+50 sama dengan 650.