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Kelipatan 5.
b = 5
U terakhir = 295
Un = a +(n-1)b
Un = 5 + (n-1)5
Un = 5 + 5n - 5
Un = 5n
295 = 5n
n = 295/5
n = 59
Maka banyak bilangannya adalah 59 suku
yaitu, 5,10,15,20,25,30,35,40,45,...,295
jumlahnya
Sn = n/2 (a+Un)
S59 = 59/2 (5+295)
S59 = 29,5 (300)
S59 = 8850