Question

1+3+5+......to n terms÷2+5+8+...to 8 terms =9, then the value of n is​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

1. in this case in 1st ap a=1 ,d=2 and in 2nd ap A=2,D=3 ,N=8
2. by Sn formula , Sn of 1st ap/Sn of 2nd ap =9
3. by putting the formula n/2[2a+(n-1)d] divided by N/2[2A+(N-1)D]=9
4. n/2[2+2n-2]divided by 8/2[4+21]=9
5. n²/100=9
6. n2=900
7. n=√900
8. n=30