**Answer:**

2

**Step-by-step explanation:**

**According to the definition of geometric progression. an= a1 · q n-1an means the n-th term, q means the common ration.from the meaning of the questiona10 = a1 · q n-1 **

**{make n=10}**

1024= a1 · 2 10-1

1024 a1 · 2 9 {subtraction}1024= a1 · 2 10-1

1024 a1 · 2 9 {subtraction}

1024= a1 · 512 *{2 9 = 512 · 210= 1024}a1= 1024/512=2 *{division}

hence the answer is 2

i hope it helps:)