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In a list of 200 numbers, each number after the first is 4 more than the number that comes before it. What is the difference between the first and the last number on this list?

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let 'x' be the first number

the difference is 4

the number of terms is 200

so you'll have:

since we already have the last term then we may be able to find the difference between the first and the last term

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