Question

3. Find the number of terms in
the A.P: 5, 7, 9, ----- 23

10
8

19
12​

Answer 1

Answer:

I think it is 19........

Answer 2

Answer:

Algebraic expression of an the AP =dn+(f-d)

[d=common difference,n=nth term,f=first term]

Algebraic expression of this AP=2n+(5-2)

=2n+3

2n+3=23

2n=23-3

2n=20

n=20/2

n=10

Number of terms in the AP is 10

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