Question 138
If a = 4011 and b = 3989 then value of ab = ?
Solution
If a = 4011 and b = 3989
ab = 4011 * 3989 = (4000 + 11) (4000 - 11)
= $$4000^{2} - 11^{2}$$ = 16000000 - 121
= 15999879
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