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U5 = 18
Cari beda
b= U5-U3/5-3
b= 18-10/5-3
b = 8/2
b = 4
Cari a
U3 = a+2b
10 = a + 2(4)
10 = a + 8
a = 2
Sn = n/2 (2a+(n-1)b)
S75 = 75/2 (2(2)+(75-1) 4)
S75 = 75/2 (4 + 296)
S75 = 75/2 (300)
S75 = 11250 (d)