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Sn= n/2 (2a+ (60-1)b
S60= 60/2 (2a + 59.2)
30 (2.1 + 118)
30(2+118)
30(120)
3600
beda (b) = 3-1 = 2
Sn = n/s (2a+(n-1)b)
S60 = 60/2 ( 2x1 + (60-1)2)
S60 = 30 (2 + (59 x 2)
S60 = 30 (2+118)
S60 = 30 (120)
S60 = 3600