hitunglah deret ini 7+10+13+16....+500 =

a = 7
b = 3
Un = 500

a + (n-1)b = Un
7 + (n-1)3 = 500
7 + 3n -3 = 500
3n = 496
n = 496 / 3

Sn = n /2 (a + Un)
Sn = 496/3/2 (7+500)
Sn = 496 / 6 (507)
Sn = 41912

langsung aja y

a = 7
b = 10-7 = 3

Un = a + (n-1)b
500 = 7 + (n-1)3
500 = 7 + 3n - 3
3n = 500 - 4
3n = 496
n = 496/3

S496/3 = 496/3 : 2 (a + Un)
S496/3 = 496/6 (7+500)
S496/3 = 496/6 (507)
S496/3 = 41.912

semoga berguna +_+