mohon bantuan nya guysss
Jawaban:
sama dengan barisan E. yaitu 27
[tex]u25 - u5 = 20b \\ 14 - 4 = 20b \\ 10 = 20b \\ \frac{10}{20} = b \\ b = \frac{1}{2} \\ \\ un = a + (n - 1)b \\4 = a + (5- 1) \frac{1}{2} \\ 4 = a + (4) \frac{1}{2} \\ 4= a + 2 \\ 4 - 2 = a \\ a = 2 \\ \\ u43 =2 + (43 - 1) \frac{1}{2} \\ u43 = 2 + (42) \frac{1}{2} \\ u43 = 2 + 21 \\ u43 = 23 [/tex]
