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Arithmetic Progressions

Question 3:

A ladder has rungs 25 cm apart. (See figure). The rungs decrease uniformly in length from 45 cm at the bottom to 25 cm at the top. If the top and bottom rungs are m apart, what is the length of the wood required for the rungs?

[Hint: number of rungs]

Answer:

It is given that the rungs are 25 cm apart and the top and bottom rungs arem apart.

∴ Total number of rungs

Now, a...

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