Question

Dalam geometri 32+16+8+..+1/8
banyaknya suku ada

Answer 1

 32+16+8+..+1/8  ------> a = 32 ; r = 1/2  ; Un = 1/8
Un = a . r^(n - 1)
1/8 = 32 .(1/2)^(n - 1)
(1/2)^(n - 1) = 1/8 : 32
(1/2)^(n - 1) = 2^-2 : 2^5
(1/2)^(n - 1) = 2^-7
   2^( - n + 1) = 2^-7
        - n + 1 = - 7
             - n = - 7 - 1
             - n = - 8
               n = 8
^ = pangkat