Question

find the 15th term from the end of the a.p.;3,5,7,9,..,201;

Answer 1

given AP
3,5,7,9,........,197,199,201

reversing the AP
201,199,197,......9,7,5,3

first term = a= 201
common difference = d= a2-a1= 199 -201 =-2
15th term of Ap = a+14d
a15 = 201+14(-2)
=201-28
=173
required number is 173