Solution
The pattern followed is that the product of the numbers is subtracted from the sum of the numbers.
Eg : $$(1+2)-(1\times2)=3-2=1$$
and $$(2+3)-(2\times3)=5-6=-1$$
and $$(3+4)-(3\times4)=7-12=-5$$
Similarly, $$(7+9)-(7\times9)=16-63=-47$$
=> Ans - (A)
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