Question

Tolong dujawab ya pakai caranya dan jangan ngasal nomor 13

Answer 1

Dik : 3, 11/2, 8, 21/2,... maka : a = U₁ = 3
                                             b = U₂ - U₁ = 11/2 - 3 = 11/2 - 6/2 = 5/2 
Un= a + (n-1).b
U₃₁ = 3 + (31 - 1). 5/2
U₃₁ = 3 + (30). 5/2
U₃₁ = 3 + 75
U₃₁ = 78

Answer 2

6/2 ,  11/2,   16/2  ,  21/2

a= 6/2
b = (11-6) /2 = 5/2

u31 = a + 30b =( 6 + 30x5)/2= (6 + 150)/2 = 156/2 = 78