in class total no. of students 15 in which 7 students speak english and 8 student speak hindi , 3 student can not speak in both language so how many student can speak both language ??please find solution

• by set theory........
  let no of students be represented in set
  n(English speaking)=7 and n(Hindi speaking)=8 and given total students that is n(EUH)=15 ...therefore the total union of sets formula gives n(EUH)=n(English speaking)+n(Hindi speaking)-n(both speaking students )+ n(none speaking students )...........................this gives
  15=8+7+3-(both speaking)
  or both speaking=18-15
  =3
  therefore 3 students speak both the languages
• 9 years agoHelpfull: Yes(7) No(0)
• total student 15
  3 student doesnt know any language
  reamaining 12 student who khow any language
  8 know english 7 know hindi .. total 15 student thus student know both language = 15-12 = 3
  so 3 student knows both language
• 9 years agoHelpfull: Yes(4) No(1)
• N(H)=8 // know hindi
  N(E)=7 // know english
  as mention that 3students can not speak in both language
  so number of student who speak either english or hindi : N(H & E)= 15-3 = 12
  N(H or E)=N(H) + N(E) - N(H & E) = 3
  
• 9 years agoHelpfull: Yes(1) No(1)
• 3 of them speak both English & Hindi.
  
• 9 years agoHelpfull: Yes(0) No(0)
• how?? please Explain
• 9 years agoHelpfull: Yes(0) No(0)