Solution
Expression = 2:10::26:?
The pattern followed is = $$n^2+1:(n+2)^2+1$$
Eg = $$1^2+1:(1+2)^2+1=2:10$$
Similarly, $$5^2+1=26$$
Thus, missing term = $$(5+2)^2+1=49+1=50$$
=> Ans - (A)
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