Question

if 1+2+3+..........+k=325 then find 1³+2³+..........+k³​

Answer 1

Answer:

Step-by-step explanation:

k(k+1)/2=325  [sum of k numbers formula]

k(k+1)=325*2=650

k=25

now sum of cubes of numbers=k^2(k+1)^2/4

=(25^2)(26)^2/4

=625*676/4

=625*169

=105625

Answer 2

Answer:

Step-by-step explanation:

105678