find the AP whose 3rd term is 5 and 7th term is 9
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so this way u can get the answet
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Given : a3 = 5
a7=9
Now,
a+ 2d=5 ......(1)
a+6d=9 ........(2)
Applying elimination
a+2d=5
a+6d=9
_ _ _
_________
-4d=-4
d=1
Putting d=1 in (1)
a+ 2(1)=5
a=3
A.p.= 3,4,5,6,7,8,9.............
a7=9
Now,
a+ 2d=5 ......(1)
a+6d=9 ........(2)
Applying elimination
a+2d=5
a+6d=9
_ _ _
_________
-4d=-4
d=1
Putting d=1 in (1)
a+ 2(1)=5
a=3
A.p.= 3,4,5,6,7,8,9.............
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