Question

Carilah 4 suku pertama dan suku ke sepuluh dari barisan bilangan dengan rumus umum berikut.

Answer 1

Mudaha2n bermanfaaat...

Answer 2

1) Un= 3n + 1
u1 = 3(1) + 1 = 4
u2 = 3(2) + 1 = 7
u3 = 10
u4 = 13

U10 = 10(3) + 1 = 30

2) Un = (-1)ⁿ/ n 
U1 = (-1)¹ / 1  = - 1
u2 = (-1)²/2  = 1/2
u3 = (-1)³/3 = -1/3
u4 = (-1)⁴/4 = 1/4
..
U10 = (-1)¹⁰/ 10 = 1/10

3. Un = (n-1)(n-2)(n-3)
U1 = (1-1)(1-2)(1-3) = 0(-1)(-2) = 0
u2 = (2-1)(2-2)(2-3) = 2(0)(-1) = 0
u3 = (3-1)(3-2)(3-3) = 2(1)(0) = 0
u4 = (4-1)(4-2)(4-3) = 3(2)(1) = 6
.
10 = (10-1)(10-2)(10-3) = 9(8)(7) = 504