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S(7)= 6(7²) - 3(7)
S(7)= 6(49) - 21
S(7)= 294 - 21
S(7)= 273
S(6)= 6(6²) - 3(6)
S(6)= 6(36) - 18
S(6)= 216 - 18
S(6)= 198
U7= S(7) - S(6)
U7= 273 - 198
U7= 75
Jadi, suku ke-7 dari deret tersebut adalah75.
sn2 = 6*2^2 - 3*2 = 24 - 6 = 18
u2 = s2 - s1
= 18 - 3 = 15
b = u2 - a
= 15 - 3 = 12
u7 = a + 6b
= 3 + 6*12 = 3 + 72 = 75