25. Assume n, k, i, a, and j are integer variables. Tell whether the following triples are valid. In case the triple is not rald gie a counieresample In these exercises. ignone he rosubow emor {i in (i-1) ! } {!..n+1 } , a+1; a = a = {i in {1.. n+1), a (i-1) !} = {i in (1-1) ! , !i