Practicing Success
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CUET
General Test
Quantitative Reasoning
Algebra
If a + b = 27 and $a^3 + b^3 = 5427$, then find ab.
143
135
176
149
If a + b = 27
$a^3 + b^3 = 5427$,
then find ab
(a + b)3 = a3 + b3 + 3ab(a+b)
(27)3 = 5427+ 3ab(27)
= 19683 - 5427 = 81ab
14256 = 81ab
ab = 176