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Un = U1 × (n-1) × b
=>Un = suku ke-n
=>U1 = suku ke-1
=>n = banyaknya suku
=>b = beda
Rumus jumlah n suku pertama dari DA :
Sn = ½n (U1 + Un)
atau
Sn = ½n (2 U1 + (n-1) ×b)