key=
i = 1: j = 10
Do While i <= j
m = (i + j) \ 2
If a(m) < Key Then
i = m + 1: n = n + 1
Else
j = m - 1: n = n - 1
End If
Loop
数组元素a(1)到a(10)的值依次是“2,2,4,6,9,15,15,20,25,30”若n值为2,则key的值可能为( )