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b. 64, 125, 216, 343, 512.
c. 22, 27, 32, 37, 42.
d. 24, 35, 48, 63, 80.
b= 4-1=3
sn =1/2 n (N-1)b
s5= 1/2. 5 (4)3
=5/2 .12=5.5=30
aku lpa lagi .. btul pa salah tu yang aa ni