is it from 100 to 400, or between 100 and 400? there's a difference.

Yes it also have a difference

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is it from 100 to 400, or between 100 and 400? there's a difference.

Yes it also have a difference

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an=last term

a1=first term

d=common difference

n= term

a1=100

an=400

d=2, difference is even,

400=100+(n-1)(2)

n=151