Question

The ratio of sum of n terms of two AP's is 4n+7 divided by 3n-5.Find the ratio of their 15th terms

Answer 1

Step-by-step explanation:

first of all we obtain a equation by using the formula of sum of 'n' terms of the given AP.

then we use the formula for finding the 'n'th term of the AP,to get the equation for the 15th term of both the APs.

Now comes the important part i.e. to find the value of'n'.

for this,we compare equations(i) and(ii).

we get,(n-1)=28,

n=28+1,

n=29.

At last,we put the value of 'n' i.e.29,we get the ratio of 15th term of both the APs.

Hope this helpss......

consider the pics for the solution.