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b = (2x + 2)- (2x +1)
= 2x + 2 - 2x - 1
= 1
un = a + (n - 1)b
2x +50 = 2x + 1 + ( n-1)1
2x + 50 = 2x + 1 = n -1
50 = n
n= 50
s50 = 1/2n ( a + u50)
4275 = 1/2*50 (( 2x + 1) + 2x + 50)
4275 = 25 ( 4x + 51)
171 = 4x + 51
4x = 171 - 51
4x = 120
x = 30