Question

consider an arithematic sequence is 40 and 10 th term is 20 what is the 15 th term?

how to find it​

Answer 1

$\huge\fbox\red{★Solution★}$

$\bf⇒x5 = 40, x10 = 20$

$\bf⇒ x10 - x5 = 5d$

$\bf⇒ 5d = 20 - 40 = -20$

$\bf⇒ d = - 4$

$\huge\red { \: \: \: \: \: \: \: \: \: \: Now,}$

$\bf⇒ x15 = x10 + 5d = 20 - 20 = 0$

★ Hope you understand this concept mate ★