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What is the sum of the first 13 terms of an arithmetic progression, if the 5th term is 1 and the 8th term is - 17?

In a frequency distribution table with 12 classes, the class-width is 2.5 and the lowest class boundary is 8.1, then what is the upper class boundary of the highest class?

Raman is a student of 10th class. In his class, his position is 16th from the top and 49th from the bottom. What is the total number of students in the class ?

What will be the day on 8th September 1998?

If 8th February 2005 was a Tuesday what was the day the 8th February 2004 ?