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a = 42
b = 47-42 = 5
maka
Sn = n/2 (2a+(n-1)b)
S30 = 30/2 ( 2 x 42 + (30-1)5)
S30 = 15 (84 + (29 x 5 )
S30 = 15 (84 + 145)
S30 = 15 (229)
S30 = 3435