Question

a2=20,a17=56 find the common difference HE1P FAST!!!!!!!!

Answer 1

Answer:

common difference is0a 17=56

Answer 2

Answer:

$\bigstar{\bold{Common\:difference\:=2.4}}$

Step-by-step explanation:

$\Large{\underline{\underline{\it{Given:}}}}$

• Seventeenth term (a₁₇) = 56
• Second term (a₂) = 20

$\Large{\underline{\underline{\it{To\:Find:}}}}$

• Common difference (d) of the AP

$\Large{\underline{\underline{\it{Solution:}}}}$

→ The common difference of the AP is given by the formula

   $d\:=\:\dfrac{a_m-a_n}{m-n}$

  where $a_m$ = 56, $a_n$ = 20, m= 17, n = 2

→ Substituting the given datas, we get

   $d\:=\:\dfrac{56-20}{17-2}$

   $d\:=\:\dfrac{36}{15}$

  $\boxed{\bold{Common\:difference\:=\:2.4}}$

$\Large{\underline{\underline{\it{Notes:}}}}$

→ The common difference of an AP is given by the formulae

•  $d\:=\:a_2-a_1$
•  $d\:=\:\dfrac{a_m-a_n}{m-n}$