The pattern followed is that the numbers at the corresponding edges are squares of consecutive natural numbers.
Eg :- Top left : $$(1)^2=1,(2)^2=4,(3)^2=9$$
Top right : $$(2)^2=4,(3)^2=9,(4)^2=16$$
Similarly, $$(5)^2=25,(6)^2=36,(7)^2=49$$
Thus, missing term =Â 49
=> Ans - (B)
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