Find the missing element in the Arithmetic Progression | GeeksforGeeks

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[Chandrakumar-ubuh]

how did you calculate the difference as the formula for d is (l-a)/n-1

[amartyadav]

This is a horrible explanation. She is just reading the slides. I know how to read too. I am here to learn the logic behind the formulae that are being used to calculate the difference and to decide if the element lies in the first half or the second half.