Please help me to solve several math problems in secondary vocational schools about the sequence of numbers. Please explain the solution process in detail.
2 . a5 = a 1 * Q4 16 = 8 1 * Q4 = 16/8 1 q = 2/9 sn = 8 1 *( 1-2/9n)/ 1-2/93 . a4 = a 1 * Q3； A25 = a1* q24a1* Q3+a1* q24 =1/4 and (A4) 2 = A 1 * A25A 1 *.
#a 1 #q3 #a25