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deret aritmatika a = 2x + 1 dan b = 1
Un = a + (n - 1).b
2x + 50 = 2x + 1 + (n - 1).1
2x - 2x + 50 - 1 = n - 1
49 = n - 1
n = 50
Sn = (n/2)( a + Un)
4275 = (50/2)( 2x + 1 + 2x + 50)
4275 = 25( 4x + 51)
171 = 4x + 51
4x = 171 - 51
4x = 120
x = 30