有哪位知道这道有关VSWR的题目是怎么做出来的吗？要过程

pwzh

What are the minimum and maximum combined VSWR limits at an interface characterized by a 1.25:1 VSWR and a 2.00:1 VSWR?
a) 1.75:1 (min), 2.25:1 (max)
b) 1.60:1 (min), 2.50:1 (max)
c) 0.75:1 (min), 3.25:1 (max)

2/1.25 = 1.6:1 (min), 2*1.25 = 2.5 (max)