Susunlah 3 suku pertama, jika diketahui a. U2 = 10 dan b = 2 b. U5 = 12 1/2 dan b = 2 1/2 c. U6 = 75 dan b = -6 tolong bantu :)

a. u2 = a + b = 10
a + 2 = 10
a = 10 - 2
a = 8

b. u5 = a + 4b = 12 1/2
a + 4(5/2) = 12 1/2
a = 12 1/2 -10
a = 2 1/2


c. u6 = a + 5b = 75
a + 5(-6) = 75
a = 75 + 30
a = 105

a. 10 - 2, 10 , 10+2  = 8,10,12
b. 2 1/2, 5 , 7 1/2
c. 107, 101 ,95