find the AP whose 3rd term is 5 and the 7th term is 9
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Answered by
1
Answer:
a.p. series are:- 3,4,5,6,7,8,9,......
Step-by-step explanation:
3rd term = 5
a+2d = 5.......(1)
7th term = 9
a+6d = 9........(2)
(2) - (1)
a+6d=9
-(a+2d=5)
4d=4
d=4/4
d=1
put the value of d in equation (1)
a+2d=5
a+2(1)=5
a+2=5
a=5-2
a=3
a.p. series are:- 3,4,5,6,7,8,9,......
Answered by
3
Step-by-step explanation:
3rd term of the AP: a+2d = 5 …(1)
7th term: a+6d = 9 …(2)
Subtract (1) from (2)
4d = 4, or
d = 1 and so a = 3.
The AP is 3,4,5,6,….
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