In an A.P the ratio of 3rd and 7th terms is 3:7. Find the ratio of 4th and 12th terms
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Answer:
Given:
a3:a7=3:7
Then a+2d:a+6d=3:7
=> 7a+14d=3a+18d
=> 4a-4d=0
=> a-d=0
=> a=d .....(i)
Now,
a4:a12 = a+3d:a+11d
= d+3d:d+11d ..... from(i)
= 4d:12d
= 4:12
= 1:3 ......Answer....
Step-by-step explanation:
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