the query whch i asked at last actually relation is asked between d and R and in the solution it is given between a and R . moreover diagram is not much clear for understanding purpose pls mention everything in that . i want a clear explanation of the question . plz do help me. thanku for ur replies. it is helping me a lot ...... culd it be possible to give answers in 1 day only ... plz try to reply fast .. thanku fo ur help....