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a= 3
U52 = 105
Sn = n/2(a+Un)
S52 = 52/2(3+105)
S52 = 26 x 108
S52 = 2808 cm
U52 = 105
Ditanyakan :
S52 =...?
b = 105-3 : 52-1
= 102 : 51
=2
S52 = n/2(2u1 + (n-1)b)
= 26( 2.3 + 102)
= 26.108
= 2808 cm