Question

Find the $9^{th}$ term from the end towards the first term of the $A.P:5,9,13,.....,185$

Answer 1

Here, $nth$ term is=$a+(n-1)d$

$⟹5+(n-1)4=185$

Hence, $n=46$

So, $9th$ term from end will be the $38th$ term of this A.P

i.e; $a+37d=5+37.\left(4\right)$

$⟹153$