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b=1
S50=4275
4275=n/2(2a+(n-1)b)
4275=50/2(2(2x+1)+(50-1)(1))
4275=25(4x+2+49)
171=4x+51
4x=120
x=30
b=1
S50=4275
4275=n/2(2a+(n-1)b)
4275=50/2(2(2x+1)+(50-1)(1))
4275=25(4x+2+49)
171=4x+51
4x=120
x=30
jawabannya 30 jamin bener