Question

8. If the nº terms of the two AP's 9. 7. 5. ........and 24. 21. 18. .........are the same, then find the value
of n Also, find that term
​

Answer 1

Answer:

3 and 15 okjjjjjjmkgghy

Answer 2

Step-by-step explanation:

First A.P. is 9,7,5,.......

Here,

First term, a=9

Common difference, d=7−9=−2

 

$n^{th}$ term,

$a_{n}$ =a+(n−1)d

$a_{n}$=9−2(n−1)

$a_{n}$=11−2n

Second A.P. is 24,21,18,.......

Here,

First term, a=24

Common difference, d=21−24=−3

 

$n^{th}$ term,

 $a_{n}$ ​=a+(n−1)d

$a_{n}$=24−3(n−1)

$a_{n}$=27−3n

$n^{th}$ term of both the progressions are equal, so

11−2n=27−3n

−2n+3n=27−11

n=16

nth term is =11−2n  

=11−32

=-21

Hope it will help you

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