Question

find sum of the first 10 terms​

Answer 1

Answer:

n=1,1|1(1+1)=1|2

n=2,1|2(2+1)=1|6

n=3,1|3(4)=1|12

n=4,1|4(5)=1|20

n=5,1|5(6)=1|30

n=6,1|6(7)=1|42

n=7,1|7(8)=1|56

n=8,1|8(9)=1|72

n=9,1|9(10)=1|90

n=10,1|10(11)=1|110