a computer program was tested 300 times before its release,the testing was done in three stages of 100 teste each.The s/w failed 15 times in stage 1,12 times in stage 2,8 times in stage 3,6 times in both stage 1 and stage 2,7 times in both stage 2 and stage 3,4 times in both stage 1 and stage 3,4 times in all the three stages.How many times the s/w failed in a single stage only

• 15-(4+2+0)=9 times the s/w failed in 1st stage only
  12-(3+4+2)=3 times the s/w failed in 2nd stage only
  8-(4+3+0)=1 times the s/w failed in 3rd stage only
  
  so,9+3+1=13 times the s/w failed in a single stage only.
• 11 years agoHelpfull: Yes(3) No(0)
• using venn diagram,
  
  15-(4+2+0)=9 times the s/w failed in 1st stage only
  12-(3+4+2)=3 times the s/w failed in 2nd stage only
  8-(4+3+0)=1 times the s/w failed in 3rd stage only
  
  so,9+3+1=13 times the s/w failed in a single stage only.
• 11 years agoHelpfull: Yes(1) No(0)
• for stage 1st
  15+6+4+4=29
  for stage 2nd
  12+6+7+4=29
  for 3rd stage
  8+7+4+4=23
  so, minimum 23 times the s/w failed in single stage
• 11 years agoHelpfull: Yes(0) No(0)