Question

2(1*2)+4(3*2)+6(5*2)+....+22(21*2)

Answer 1

Answer:

3784

Step-by-step explanation:

2(1*2)+4(3*2)+6(5*2)+....+22(21*2)

2n((2n-1)*2)=4n(2n-1)

n=1 to 11

1 >> 4

2 >> 24

3 >> 60

4 >> 112

5 >> 180

6 >> 264

7 >> 364

8 >> 480

9 >> 612

10 >> 760

11 >> 924

Sum >> 3784