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U2 = 15
b = U2 - U1 = 15 - 11 = 4
Un = a + ( n - 1 ) x b
U30 = 11 + 29 x 4
U30 = 11 + 116
U30 = 127
2.U1 = a = 1
U2 = 3
b = U2 - U1 = 3 - 1 = 2
Sn = n/2 x ( 2a + ( n - 1 ) x b )
S20 = 10 x ( 2 + 19 x 2 )
S20 = 10 x 40
S20 = 400
a = 11
b = 4
Maka :
Un = a + (n - 1)b
U30 = 11 + (30 - 1)4
= 11 + 29(4)
= 11 + 116
= 127
2.) Diketahui :
a = 1
b = 2
Maka :
Sn = n/2(2a + (n - 1)b)
S20 = 20/2 (2(1) + (20 - 1)2)
= 10 (2 + 19(2))
= 10 (2 + 38)
= 10 (40)
= 400
Semoga membantu :)