doubt

[rakesh ky]

i have doubt in act question 8 in q.5

Let B={B={Anil, Ramu, Suraj}} and G={G={Neha, Keerthi}} be the sets of boys and girls respectively. Ramu is brother of Neha, Anil is brother of Keerthi, Suraj is brother of Neha and Keerthi. Let us define a relation RR as follows, R={(a,b)|(a,b)∈B×G,aR={(a,b)|(a,b)∈B×G,a is brother of b}b}. Which of the following will be RR?  

[Aayushi Dayal]

in this question, the elements in R contains (B,G). Ramu and Suraj are brothers of Neha. and Anil and Suraj are brothers of Keerthi. so they all are siblings because Suraj is a brother to all the others. So R will contain all elements, not just a subset of BXG. Hope it helps.