Q31 of 202 Page 10

The sum of n terms of two A.P.'s are in the ratio 5n + 9 : 9n + 6. Then, the ratio of their 18th term is

Let a1 and a2 be the first terms of the two A.P. and d1 and d2 be the common difference of the two A.P


According to the given condition,



Substituting n= 35 in……… (1)



an = a + (n–1) d



Or 179: 321

More from this chapter

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29

Two A.P.'s have the same common difference. The first term of one of these is 8 and that of the other is 3. The difference between their 30th terms is

 30

If 18, a, b, –3 are in A.P., the a + b =

 32

If , then n =

 33

The sum of n terms of an A.P. is 3n2 + 5n, then 164 is its