Question

Tolong jawab yang benar pakai cara !!!

Answer 1

2)
a)
Un = a + (n-1)b

U2 = a + (2-1)b
6 = a + b

U11 = a + (11 - 1)b
24 = a + 10 b

eliminasi a
6 = a + b
24 = a + 10b
__________ -
-18 = -9b
b = -18/-9
b = 2

substitusi b = 2 ke
6 = a + b
6 = a + 2
a = 6 - 2
a = 4

suku pertama = 4, beda = 2

b)
U40 = 4 + (40 - 1)2
U40 = 4 + (39 × 2)
U40 = 4 + 78
U40 = 82

c)