If a+b+c=12,a+b=4,and a+c=7 ,what is the value of a?
সমাধান
সঠিক উত্তর: Option B
a+b+c=12........(i)
a+b=4.......(ii)
a+c=7...(iii)
(ii)+(iii) 2a+b+11..(iv)
(iv)-(i) a=11-12
অতএব ,a=-1
a+b=4.......(ii)
a+c=7...(iii)
(ii)+(iii) 2a+b+11..(iv)
(iv)-(i) a=11-12
অতএব ,a=-1
