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a = 2x + 1
b = 2
S26 = 4275
S26 = 26/2 (2a + (n-1)b)
= 26/2 (2.(2x+1) + (50-1)2)
= 13 (4x + 2 +98)
= 13 (4x + 100)
4275 = 52x + 1300
4275-1300 = 52x
2975 = 52x
x = 57,21
kalau (2x+50) kayanya ga ada.
Maaf...