# Algebra: Sequences and Expansions

1. The coefficient of x6y4 in the expansion of (2x-y)10 is ?

2. An arithmetic sequence has a=15 and the common difference d=-3/2. Find the value of 10 over Sigma k=5 ak = the kth term of the sequence.

3. Find the 3rd term in the expansion of (x+6)10.

https://brainmass.com/math/basic-algebra/algebra-sequences-expansions-5589

#### Solution Preview

Please see the attached file for the full solution.

Thanks for using BrainMass.

1. The coefficient of x6y4 in the expansion of (2x-y)10 is ?

It's well known that ...

#### Solution Summary

Sequences and Expansions are analyzed to find terms and coefficients

$2.19