Question

Find the 15th term from end for A.P., 10, 15, 20, 25, 30,..., 1000​

Answer 1

Step-by-step explanation:

follow the above steps

Answer 2

S O L U T I O N :

$\bf{\large{\underline{\bf{Given\::}}}}}$

A.P. are 10,15,20,25,30.........1000.

$\bf{\large{\underline{\bf{To\:find\::}}}}}$

The 15th term.

$\bf{\large{\underline{\bf{Explanation\::}}}}}$

We know that formula of an A.P;

$\boxed{\bf{a_n=a+(n-1)d}}}}}$

• a is the first term.
• d is the common difference.
• n is the term of an A.P.

So;

a = 10 , d = 15 - 10 = 5 n = 15

$\longrightarrow\sf{a_{15}=10+(15-1)(5)}\\\\\longrightarrow\sf{a_{15}=10+14\times 5}\\\\\longrightarrow\sf{a_{15}=10+70}\\\\\longrightarrow\bf{a_{15}=80}$

Thus;

The 15th term will be 80 .