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The pages of a book are numbered 0, 1, 2 . upto M, M>0. There are four categories of instructions that direct a person in positioning the book at a page. The instruction types and their meanings are :
1. OPEN : Position the book at page No. 1
2. CLOSE : Position the book at page No. 0
3. FORWARD, n :From the current page move forward by n pages; if, in this process, page number M is reached, stop at M.
4. BACKWARD, n : From the current page, move backward by n pages; if in this process, page number 0 is reached, stop at page number 0.
In each of the following questions, you will find a sequence of instructions formed from the above categories. In each case, let $$n_1$$ be the page number before the instructions are executed and $$n_2$$ be the page number at which the book is positioned after the instructions are executed.
Option B and C are irrelevant and in option D, $$ n_1$$ should be 0
Hence option A will be our answer as $$n_1$$ is the value before instruction as 0 and $$n_2$$ is value after instructions which is also 0.
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