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If a = 4011 and b = 3989 then value of a...

If a = 4011 and b = 3989 then value of ab = ?

A

15989979

B

15998879

C

15999879

D

15899879

Text Solution

Verified by Experts

The correct Answer is:
C
`ab=4011xx3989`
`=(4000+11)(4000-11)`
`=(4000)^(3)-(11)^(2)`
`=1600000-121`
=15999879
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