Please help. Real answers please. What is the 4th term of the expansion (1-2x)^n if the binomial coefficients are taken from the row of Pascal's triangle shown here?

1 6 15 20 15 6 1

A. -160x^3
B. 160x^3
C. 240x^4
D. -20x^3

-160x³

Step-by-step explanation:

4th term: n = terms - 1 = 4-1 = 3

1*1⁶*(-2x)⁰ + 6*1⁵*(-2x)¹ + 15*1⁴*(-2x)² +20*1³*(-2x)³ + 15*1²*(-2x)⁴ +

                                                                 ↑

                                                             4th term

20*1³*(-2x)³ = 20*(-8x³) = -160x³

step-by-step explanation: