1 Answers
Option 1 : 4
[ alt="RRB-NTPC-31-03-2016-Shift-2 Madhu 2 Reviewed images Q10" src="//storage.googleapis.com/tb-img/production/17/07/RRB-NTPC-31-03-2016-Shift-2_Madhu_2%20Reviewed_images_Q10.PNG" style="height:80px; width:289px">
Thus, ‘root’ is denoted by 4.
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