Question

24. The common difference of an Anthmetic Progression whose nºterm is a=5-2n is
a) -3
b)-2
c)-1
d) 2​

Answer 1

Answer:

progression as an=2n+1

Now, we will put the values of n=1,2,3,4,...

in an=2n+1

in order to get the AP.

For n=1

we get,

a1=2(1)+1

⇒a1=2+1

⇒a1=3

For n=2

we get,

a2=2(2)+1

⇒a2=4+1

⇒a2=5

For n=3

we get,

a3=2(3)+1

⇒a3=6+1

⇒a3=7

For n=4

we get,

a4=2(4)+1

⇒a4=8+1

⇒a4=9