Let X be the set consisting of the first 2018 terms of the arithmetic progression 1,6, 11,.... and Y be the set consisting of the first 2018 terms of the arithmetic progression 9,16,23,... Then, the number of elements in the set `X uu U ` is ____

Let X be the set consisting of the first 2018 terms of the arithmetic progression 1, 6, 11 , ddot, and Y be the set consisting of the first 2018 terms of the arithmetic progression 9, 16 , 23 , ddot . Then, the number of elements in the set XuuY is _____.

Let X be the set consisting of the first 2018 terms of the arithmetic progression 1,\ 6,\ 11 ,\ ddot, and Y be the set consisting of the first 2018 terms of the arithmetic progression 9,\ 16 ,\ 23 ,\ ddot . Then, the number of elements in the set XuuY is _____.

The sum of the fourth and twelfth term of an arithmetic progression is 20. What is the sum of the first 15 terms of the arithmetic progression?

In an arithmetic progression, the 24^(th) term is 100. Then the sum of the first 47 terms of the arithmetic progression is

The sum of the fourth and twelfth term of an arithmetic progression is 20. What is the sum of the first 15 terms of the arithmetic progression?

In an arithmetic progression, the 24 th term is 100. Then the sum of the first 47 terms of the arithmetic progression is :

In an artimetic progression, the 24th term is 100. Then, the sum of the first 47 terms of the arithmetic progression is

If the sum of the first 100 terms of an arithmetic progression is -1 and the sum of the even terms is 1, then the 100^("th") term of the arithmetic progression is