apang

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%a in (b.txt) do (
  set/a n+=1
  set ".!n!=%%a"
)
set/a r=!random! %% !n!+1
(for /f "delims=" %%a in (a.txt) do (
  set/a m+=1
  if !m! neq 2 (echo %%a
  ) else for %%b in ("!r!") do echo !.%%~b!
))>Result.txt
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