Considering the case above, what are the other pages which must be missing?
Details and assumptions:
If page 1 is missing it means, the whole sheet including the last page is missing.
Include pages 6 and 9 in your answer.
If you think the missing pages are: 1, 2, 3 and 4 provide the answer as \(1+2+3+4+6+9=25\).