jumlah seluruh bilangan kelipatan empat antara 50 dan 100

a = 52
b = 4

Un = a + ( n-1) b
96 = 52 + (n-1) 4
96 = 52 + 4n - 4
96 = 4n + 48
96 - 48 = 4n
48 = 4n
[tex]n = \frac{48}{4} [/tex]
n = 12

Sn = n/2 ( a + Un )
S₁₂ = 12/2 ( 52 + 96 )
S₁₂ = 6(148)
S₁₂ = 888

a = 52
b = 4
Un = 96

Un = a + (n-1)b
96 = 52 + 4n - 4
4n = 48
n = 12

Sn = 1/2 n (a + Un)
= 1/2 . 12 (52 + 96)
= 6 (148)
= 888