Question

the 21st term of AP 10;6;2.......is​

Answer 1

Answer:

n=10+(21-1)(-3)

n=10-60

n=-50

Step-by-step explanation:

Answer 2

Given :-

• A.P = 10 , 6 , 2 ....
• First term = 10
• Common difference = - 4
• Number of terms = 21

To Find :-

• 21st term of the given A.P

Solution :-

$\begin{gathered}\longrightarrow \:\underline{ \boxed{ \sf A_n = a + (n - 1)d}} \\ \\\longrightarrow \: \sf A_n = 10 + (21 - 1)( - 3) \\ \\ \longrightarrow \: \sf A_n = 10 + 20( - 3) \\ \\\longrightarrow \: \sf A_n = 10 - 60 \\ \\\longrightarrow \: \underline{ \boxed{\sf A_n = - 50}} \\ \\ \underline{ \large \green{ \sf \therefore \: 21st \: term \: of \: the \: Ap \: is \: - 50}}\end{gathered}$