Solution
In each column the pattern followed is that the sum of second term and the product of last two terms is equal to the first term.
Eg :- $$4+(5\times3)=19$$
and $$5+(6\times4)=29$$
Similarly, $$3+(x\times6)=45$$
=> $$6x=45-3=42$$
=> $$x=\frac{42}{6}=7$$
=> Ans - (B)
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