Question

The sum of n terms of two series in A.P. are in the ratio 5n+4 :9n +6 . Find the ratio of their 13th terms?​

Answer 1

Answer:

5:9

Step-by-step explanation:

Ratio of sum of n terms 2 A.P = 5n+4 : 9n+6

So, Ratio Sum of 13 terms = 5*13+4 : 9*13+4 (put n=13)

= 69 : 123

Now, Ratio Sum of 12 terms = 5*12+4 : 9*12+4 (put n=12)

= 64 : 114

So to claculate 13th term we will simple subtract sum of first 12 terms from sum of first 13 terms

i.e, Sum(13) - Sum(12) = = 69 : 123 - 64 : 114

So,

Ratio of 13th term of 2 APs will be = 5 : 9

hope it help you friend

follow me ^_^

Answer 2

Answer:

heya ✌️✌️

Step-by-step explanation:

Note: pls refer to the attached file