Aspire Faculty ID #16443 · Topic: NIMCET 2009 · Just now
NIMCET 2009

From 50 students: 37 passed Math, 24 Physics, 43 Chemistry. At most 19 passed Math & Physics, at most 29 passed Math & Chemistry, at most 20 passed Physics & Chemistry. Intersection of all 3 is $x$. Find maximum possible value of $x$.

Solution

Use: $M + P + C - (MP + MC + PC) + x \le 50$ 
 Substitute maximum overlaps: 
$37 + 24 + 43 - (19 + 29 + 20) + x \le 50$ 
 Compute: 
$104 - 68 + x \le 50$ 
$36 + x \le 50$ 
$x \le 14$ 
 But each pair overlap already includes $x$, so consistency check: 
Maximum possible $x = \min(19, 29, 20) = 19$ 
No — limited by total count equation → 14. 
 But must satisfy all pair limits: 
 If $x=14$: 
MP = 19 → remaining just 5 MC = 29 → remaining 15 PC = 20 → remaining 6 All non-negative. Thus x = 14 possible → but not in options.

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