Use sum notation to rewrite the following sum: 6+10+14+...+(4n-2)?
1) sum_(k=1)ⁿ (4K⁺2)
2) sum_(k=2)⁽ⁿ⁻¹⁾ (4k-2)
3) sum_(k=0)ⁿ (4K⁺6)
4) sum_(k=2)ⁿ (4k-2)
5) All answers are not correct.