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
31