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un = a + (n-1)b
296 = 104 + (n-1) 4
296 = 104 + 4n - 4
296 - 104 + 4 = 4n
4n = 196
n = 49
S49 = 1/2n ( a + u49)
= 1/2x49 ( 104 + 296)
= 24,5 (400)
= 9.800
100:4 = 25
300:4 = 75
kelipatan 4 antara 100-300 = 75-25= 50 bilangan.
S50=n/2(a+Un)
=50/2(104+300)
=25(404)
=10.100