A4*2 = A3
A3*2 = A2 = 2*2*A4
A2*2 = A1 = 2*2*2*A4 = 8*A4
Answer: 8 pieces of A4 zized papers will fit on 1 sheet of A1.
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4 pieces of A4 fit on one piece of A2.
An A4 page is too large to fit into an A5 page, as A4 is twice as large than A5. An A5 page would fit into an A4 page twice.
Here a1 = -6, a2 = -1, a3 = 4 & a4 = 9 d = a2-a1 = -1-(-6) = -1+6 = 5 d = a3-a2 = 4-(-1) = 4+1 = 5 d = a4-a3 = 9-4 = 5 Therefore the common difference d = 5
4 roughly
A4 paper has 210 x 297 mm. You can convert that to inches if you like (divide the numbers by 25.4).