dere are 600 employees in 3 deptsnd they r 300 ,350,100. employees can wrk in one or two or all the 3 depts. no. of employee in exactly 2 dept is 120. find the no. of employees in all 3 dept???

dere are 600 employees in 3 deptsnd they r 300 ,350,100. employees can wrk in one or two or all the 3 depts. no. of employee in exactly 2 dept is 120. find the no. of employees in all 3 dept???

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