Question

2 + 3 + 5 + 6 + 8 + 9 +........+(3n-1)+(3n).​

Answer 1

your answer is

35 n

Answer 2

f(x)={2+5+8+....(3b-1)}+{3+6+9+....+3n}

f(x)={(n/2)(2+3n-1)} + {(n/2)(3+3n)}

f(x)={(n/2)(2+3n-1+3+3n)}

f(x)={(n/2)(4+6n)}

f(x)={n(2+3n)}

f(x)=3n²+2n

thanks