A) 15999879
B) 15899879
C) 15989979
D) 15998879
Correct Answer: A
Solution :
\[a=4011,\,\,b=3989\] \[\therefore \] \[ab=4011\times 3989\] \[=(4000+11)(4000-11)\] \[={{(4000)}^{2}}-{{(11)}^{2}}\] \[=16000000-121\] \[=15999879\]You need to login to perform this action.
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