Solution
The pattern here followed is $$n:n^2+1$$
(A) : $$11^2+1=121+1=122\neq120$$
(B) : $$17^2+1=289+1=290$$
(C) : $$21^2+1=441+1=442$$
(D) : $$12^2+1=144+1=145$$
=> Ans - (A)
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