Please answer correct with good presentation

15. A rug manufacturer has decided to use ve compatible :01ch in her rugs. However. in mung a rug, on\" fwr spindias can be used. 1n advertising. the rug manufacturer wants lo indicate [ha groupmgs {or 5319. Haw many cal-or groupings using the {we colors num bar of different mior taken fuur at a time are mere? {This assumes that four different colors will go into new mgrin other words. there are no repetitions of color.)