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Kelas IX
a = 50
b = 2
n = 120 : 20 = 6
Un = a.r^n
U6 = 50.2^6
U6 = 50.64
U6 = 3200
2)
U7 = a + 6b = 38
U3 = a + 2b = 18
___________ -
4b = 20
b = 5
a +10 = 18
a = 8
U24 = a + 23b
= 8 + 23.5
= 123
Sn = n/2 (a+Un)
S24 = 24/2 (8+123)
S24 = 12.131 = 1572
Mohon maaf apabila ada kesalahan