Question 138

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

Solution

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If a = 4011 and b = 3989

ab = 4011 * 3989 = (4000 + 11) (4000 - 11)

= $$4000^{2} - 11^{2}$$ = 16000000 - 121

= 15999879

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