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MHT CET · Maths · Mathematical Reasoning

Consider the three statements -
\(\mathrm{p}: \forall \mathrm{n} \in \mathbb{N}, 10 \mathrm{n}-3\) is a prime number, when n is not divisible by 3 .
\(\mathrm{q}: \frac{2}{\sqrt{3}}, \frac{-2}{\sqrt{3}}, \frac{-1}{\sqrt{3}}\) are the direction cosines of a directed line.
\(\mathrm{r}: \sin x\) is an increasing function in the interval \(\left[\frac{-\pi}{2}, \frac{\pi}{2}\right]\).
Then which of the following statement pattern has truth value true?

  1. A \((p \wedge q) \leftrightarrow r\)
  2. B \((p \rightarrow q) \rightarrow \sim r\)
  3. C \((\sim p \vee q) \wedge r\)
  4. D \((\sim \mathrm{p} \wedge \sim \mathrm{q}) \leftrightarrow \sim \mathrm{r}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \((\sim p \vee q) \wedge r\)

Step-by-step Solution

Detailed explanation

\( p: \text{Let } n=8. 10(8)-3 = 77 = 7 \times 11 \). Not prime. \( p \) is F. \( q: l^2+m^2+n^2 = \left(\frac{2}{\sqrt{3}}\right)^2 + \left(\frac{-2}{\sqrt{3}}\right)^2 + \left(\frac{-1}{\sqrt{3}}\right)^2 = \frac{4}{3}+\frac{4}{3}+\frac{1}{3} = 3 \ne 1 \). \( q \) is F.