1.

The first term of an arithmetic progression is 13 and the common difference is 4. Which of the following will be a term of this AP? (a) 4003 (b) 10091 (c) 7881 (d) 13631 

Answer»

Correct option (c) 7881

Explanation:

The series would be given by: 13, 17, 21... which essentially means that all the numbers in the series are of the form 4n + 13 or 4k + 1( Where k = n + 3). Only the value in option (c) is a 4k + 1 number and is hence the correct answer. 



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