5+9+13+.......upto n. termsIf 7+9+11+..... upto (n+1) terms=1716 then n is equal to
5+9+13+..... n terms 7+9+.....to (n+1) terms=1716
n2[10+(n−1)4]n+12[14+n2]=1716
n[4n+6](n+1)(n+7)=1716
n[4n+6](n+1)(2n+14)=1716
n(2n+3)(n+1)(n+7)=1716
32n2+48n=17(n2+8n+7)
15n2+48n−136n−119=0
15n2−88n−119=0
15n2−105n+17n−119=0
15n(n−7)+17(n−7)=0
n=7