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hanuman_2000

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I am glad to hear that you are currently asking many Maths Olympaid questions.

In HK, these kinds of questions are called" Planting trees Questions".

When you take the difference between the pages, you miss one.

In fact, you miss the first page or the last page as difference regards to interval.

You need to add one to the difference as you want both first and last.

Take difference only when you only want first or last.

Minus one when you don't want either the first or the last one.

May I know what does grade 4 refer to?

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