Question

the AP whose 3rd term is 5 and the 7th term is 9.

Answer 1

Answer:

AP=3,4,5,.......

Step-by-step explanation:

Heyaa

A3 = A+2D=5 ---------------(1)

A7 = A+6D=9 ---------------(2)

Eliminating the equations (1) and (2),

A+3D=5 ----> A +3D=5

-(A+6D=9) ----> -A -6D=-9

__________

-4D=-4

D=1

Placing the value of D in equal. (1),

We'll get,

=A+2(1)=5

=A=5-2

=A=3

A is the first term and D is the common difference,

AP =3,4,5,.........

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