Find all the sequences, which are simultaneously arithmetic and geometric progressions.

Find the sums of the indicated number of terms of the following geometric progressions : 2,-1/2,1/8 , ........., n terms, 12 terms.

Find the sums of the indicated number of terms of the following geometric progressions : 1,1/3,1/9 .........., n terms, 5 terms.

Find the sums of the indicated number of terms of the following geometric progressions : x^2-y^2,x-y, (x-y)/(x+y) , ...., n terms (x+y ne 1) .

Find out which of the following sequences are arithmetic progressions. For those which are arithmetic progressions, find out the common difference. :- -225,-425,-625,-825,….

Find out which of the following sequences are arithmetic progressions. For those which are arithmetic progressions, find out the common difference. :- 3,6,12,24,….

Find out which of the following sequences are arithmetic progressions. For those which are arithmetic progressions, find out the common difference. :- 0,-4,-8,-12…..

Find out which of the following sequences are arithmetic progressions. For those which are arithmetic progressions, find out the common difference. :- 12, 2,-8,-18,……

Find out which of the following sequences are arithmetic progressions. For those which are arithmetic progressions, find out the common difference. :- 3, 3, 3, 3, …….

Find out which of the following sequences are arithmetic progressions. For those which are arithmetic progressions, find out the common difference. :- 1/2,1/4 , 1/6 , 1/8 , ……

Find out which of the following sequences are arithmetic progressions. For those which are arithmetic progressions, find out the common difference. :- 1.0, 1.7, 2.4, 3.1,….