🎓 MAH CET MCA📅 Year: 2025📚 Mathematics🏷 Probability Distribution
3
The probability distribution function of a random variable $X$ is given by
$f(x) = \dfrac{x}{18}, ; 0 \le x \le 6$
$= 0, \text{ otherwise}$
Then the value of $P(X > 2)$ is
Let $X \sim \text{Binomial}(n = 10, p = 0.5)$
$P(X \ge 6) = \sum_{r=6}^{10} \binom{10}{r} (0.5)^{10} = 0.377$
🎓 MAH CET MCA📅 Year: 2025📚 Mathematics🏷 Probability Distribution
4
If, for a binomial distribution, the number of trials is $9$, the variance is $2$ and the probability of success is greater than that of failure, find the probability of both success.
For a binomial distribution, variance $= npq = 2$ and $n = 9$.
So, $9p(1 - p) = 2 \Rightarrow 9p - 9p^2 = 2 \Rightarrow 9p^2 - 9p + 2 = 0$.
$\Rightarrow p = \dfrac{9 \pm \sqrt{81 - 72}}{18} = \dfrac{9 \pm 3}{18}$.
Hence, $p = \dfrac{2}{3}$ or $\dfrac{1}{3}$.
Since probability of success is greater than failure, $p = \dfrac{2}{3}$.
🎓 MAH CET MCA📅 Year: 2025📚 Mathematics🏷 Probability
4
Two customers, Rachana and Bhakti, are visiting a particular shop in the same week (Tuesday to Saturday). Each is equally likely to visit the shop on any day as on another day. What is the probability that both will visit the shop on consecutive days?
Total days = 5 (Tuesday to Saturday).
Total possible pairs $= 5 \times 5 = 25$.
Consecutive day pairs = $(T,W), (W,T), (W,Th), (Th,W), (Th,F), (F,Th), (F,S), (S,F)$ → total 8.
So, $P = \dfrac{8}{25}$.
🎓 MAH CET MCA📅 Year: 2025📚 Quantitative Aptitude 🏷 Mensuration
2
A pendulum swings through an angle of $30^\circ$ and describes an arc of $17.6\ \text{cm}$ in length. Find the length of the pendulum.
Each cube side $a = \sqrt[3]{64} = 4\ \text{cm}$.
When joined end to end, dimensions of cuboid $= 8 \times 4 \times 4$.
Surface area $= 2(lb + bh + hl) = 2(8\times4 + 4\times4 + 4\times8) = 2(32 + 16 + 32) = 160\ \text{cm}^2$.
🎓 MAH CET MCA📅 Year: 2025📚 Quantitative Aptitude 🏷 Ratio Proportion and Variation
4
The incomes of $A$, $B$ and $C$ are in the ratio $7 : 9 : 12$ and their spending are in the ratio $8 : 9 : 15$. If $A$ saves $\dfrac{1}{4}$ of his income, then the savings of $A$, $B$ and $C$ are in the ratio of
Let incomes be $7x, 9x, 12x$ and expenditures be $8y, 9y, 15y$.
Saving of $A = 7x - 8y = \dfrac{1}{4}(7x) \Rightarrow 7x - 8y = \dfrac{7x}{4} \Rightarrow 8y = \dfrac{21x}{4} \Rightarrow y = \dfrac{21x}{32}$.
Savings:
$A = \dfrac{7x}{4}$,
$B = 9x - 9y = 9x - 9\left(\dfrac{21x}{32}\right) = \dfrac{99x}{32}$,
$C = 12x - 15y = 12x - 15\left(\dfrac{21x}{32}\right) = \dfrac{69x}{32}$.
Hence ratio $= 56 : 99 : 69$.
🎓 MAH CET MCA📅 Year: 2025📚 Logical Ability and Logical Reasoning🏷 Time and Distance
3
Two trains, A and B, start simultaneously from two stations $300\ \text{km}$ apart. Train A travels at $60\ \text{km/h}$, and Train B travels at $90\ \text{km/h}$. If a bird starts flying from Train A towards Train B at $120\ \text{km/h}$ and immediately turns back upon reaching Train B, continuing this until the trains meet, what total distance does the bird cover?
Time for trains to meet $= \dfrac{300}{60+90} = 2\ \text{h}$.
Bird flies the whole time at $120\ \text{km/h}$, so distance $= 120 \times 2 = 240\ \text{km}$.
🎓 MAH CET MCA📅 Year: 2025📚 Mathematics🏷 Trigonometry
1
Find the distance from the eye at which a coin of $2\ \text{cm}$ diameter should be held so as to conceal the full moon whose angular diameter is $31'$.
🎓 MAH CET MCA📅 Year: 2025📚 Quantitative Aptitude 🏷 Mensuration
1
A circular wire of radius $7.5\ \text{cm}$ is cut and bent to lie along the circumference of a hoop of radius $120\ \text{cm}$. Find (in degrees) the angle subtended at the hoop’s centre.