Recent activity by Shoto

Ten tickets numbered $1, 2, 3, \ldots 10.$ Six tickets are selected at random one at a time with replacement. The probability of the largest number appearing on the sele...

Let $\text{A}$ and $\text{B}$ two solid spheres such that the surface area of $\text{B}$ is $300\%$ higher than the surface area of $\text{A}.$ The volume of $\text{A}$ i...

An elevator has a weight limit of $630$ kg. It is carrying a group of people of whom the heaviest weighs $57$ kg and the lightest weighs $53$ kg. What is the maximum poss...

If $a, b$ and $c$ are three real numbers, then which of the following is not true?$\mid a+b \mid\leq \mid a \mid+\mid b \mid$$\mid a – b \mid \leq \mid a \mid + \mid b\m...

The natural numbers are divided into groups as $(1), (2,3,4), (5,6,7,8,9), \dots $ and so on. Then, the sum of the numbers in the $15 \text{th}$ group is equal to $6090$$...

Look carefully for the pattern, and then choose which pair of numbers comes next$17 \: 17 \: 34 \: 20 \: 20 \: 31 \: 23$$26 \: 23$$23 \: 33$$27 \: 28$$23 \: 28$

$\text{A}$ can complete a piece of work in $4$ days. $\text{B}$ takes double the time taken by $\text{A, C}$ takes double that of $\text{B},$ and $\text{D}$ takes double ...