find the geometric means of the geometric sequence whose first term is 5 and 5th term is 405
Answer (1)
Answer:an = a1 * r^(n-1)405 = 5 * r^(5-1)405 = 5 * r^4405/5 = r^481 = r^481^(1/4) = r3 = r----------------a1 = 5a2 = 5 * 3 = 15a3 = 15 * 3 = 45a4 = 45 * 3 = 135a5 = 405
