JEE Main 2021 (Online) 26th August Morning ShiftQuestion 1
Out of all the patients in a hospital $89\%$ are found to be suffering from heart ailment and $98\%$ are suffering from lungs infection. If $K\%$ of them are suffering from both ailments, then $K$ can not belong to the set :
Sets, Relations and Function
Solution
$K\le 89$ and $K\ge 89+98-100=87$, so $K\in[87,89]$. Set (C) $\{79,81,83,85\}$ has no admissible element; others each contain 88, 89 or 87. Option (C).