Question

Yang ngerti tolong jawab :D

Answer 1

U3 = 10
a + 2b = 10
U7 = 22
a + 6b = 22
a + 2b = 10 -
    4b = 12
     b = 3
a + 2b = 10
a + 2(3) = 10
a + 6 = 10
a = 4
Sn = n/2 (2a + (n-1)b)
 S30 = 30/2 (2(4) + 29 (3))
     = 15 (8 + 87)
     = 15 (95)
     = 1.425  (A)