Question

if 2+5+8+......n terms /7+11+15+.... n terms = 23/35 , find n​

Answer 1

Step-by-step explanation:

2+5+8+....n terms /7+11+15+....n terms=23/35

n/2{2.2+(n-1).3}/n/2{7.2+(n-1).4}=23/35

(4+3n-3)/(14+4n-4)=23/35

(1+3n)/(10+4n)=23/35

35+105n=230+92n

105n-92n=230-35

13n=195

n=195/13=15

n=15