I want the explanation 

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What is set define

• find the fourth vertex of the parallelogram whose consecutive vertices are (2,4,-1),(3,6,-1)and(4,5,1).

• find the fourth vertex of the parallelogram whose consecutive vertices are (2,4,-1),(3,6,-1)and(4,5,1).

physics classes 11th

  9^n+1-8n-9 solving correct

Anything Power -1 -2......

What is answer 

Triangle