Is 55 a term of te seqwuence 1,3,5,7..? If yes find which term it is.

Find whether 55 is a term of the AP 7, 10, 13, … or not. If yes, find which term it is.

Which term of the sequence -1,3,7, 11 , ... is 95 ?

The tenth term of the AP: 1,3,5,7, ……. Is ……..

Which term of the series : 21, 18, 15, is -81 ? Can any term this series be zero ? If yes, find the number of terms.

The sum of the series 1-3+5-7+9-11+ . . . . To n terms is

(a) Find the 10th term of the progression 1 + 3 + 5 +7+ ... (b) Find the 7th term of the progression 80 + 77 +74+ … (c) Find the 22nd term of the progression 7(3)/(4)+9(1)/(2)+11(1)/(4)+... (d) Find the nth term of the progression - 5 - 3 - 1 + 1 +...

(a) Find the 10th term of the progression 1 + 3 + 5 +7+ ... (b) Find the 7th term of the progression 80 + 77 +74+ … (c) Find the 22nd term of the progression 7(3)/(4)+9(1)/(2)+11(1)/(4)+... (d) Find the nth term of the progression - 5 - 3 - 1 + 1 +...

Find the indicated terms in each of the sequences in Questions 7 to 10 whose nth term are : a_(n)=(-1)^(n-1)n^(3),a_(9)

In the arithmetic progressions 2,5,8,… upto 50 terms and 3,5,7,9… upto 60 terms, find how many terms are identical.

Find the sum of first 20 terms of an A.P., in which 3r d terms in 7 and 7t h term is tow more than thrice of its 3r d term.