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Un= a+(n-1)b
51= -50+(n-1)1
51= -50+n-1
51= -51+n
-51+n= 51
n= 51+51
n= 102
Sn= n/2 (a+Un)
Sn= 102/2 (-50+51)
Sn= 102/2 (1)
Sn= 51 <--------- jawaban
Maaf kalo keliru
b = - 49 - -50= 1
un = a + (n-1)b (mencari n untuk 51)
51 = -50 +(n-1)1
51= -50 + n -1
51- (-50) + 1 = n
n = 51 + 50 + 1 = 102
sn = 1/2 n ( a + un)
= 1/2 *102 ( -50 + 51)
= 51 (1)
= 51