Question

find the value of 2^3+4^3+6^3.....…...to 20 terms​

Answer 1

Answer:

3,52,800

Step-by-step explanation:

2³+4³+6³+8³.........n terms

2³(1³+2³+3³+4³+...... nterms)

2³[n²(n+1)²]

4

8[n²(n+1)²]

4

2n²(n+1)²

Here n=20

So 2n²(n+1)²=2(20)²(21)²

=3,52,800