Un=3n+4 Tentukan jumlah 500 suku pertama

U1 = 3(1) + 4 = 7
U500 = 3(500) + 4 = 1500 + 4 = 1504

S500 = 1/2 (500) {u1 + u500)
S500 = 250 (7 + 1504)
S500 = 250 (1511) = 377750

Sn=1/2n(a+Un)
=1/2×500(7+(3×500+4))
=250(7+1504)
=250×1511
=377750
Maaf kalau salah