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Verified answer
No.119, 16, a, 36, 49, b, 81, ...
= 3² , 4², x², 6², 7² , y² , 9²
jadi x = 5 dan y = 8
a = x²
a = 5²
a = 25
b = y²
b = 8²
b = 64
No. 12
3, 10, 29, 66, 127, .....
7 19 37 61
12 18 24
6 6
a = 3
b = 7
c = 12
d = 6
Un = a + b(n - 1) + c(n - 1)(n - 2)/2 + d(n - 1)(n - 2)(n - 3)/6
Un = 3 + 7(n - 1) + 6(n - 1)(n - 2) + (n - 1)(n - 2)(n - 3)
Un = 3 + 7n - 7 + 6(n² - 3n + 2) + (n³ - 6n² + 11n - 6)
Un = -4 + 7n + 6n² - 18n + 12 + n³ - 6n² + 11n - 6
Un = n³ + 2