Shown on the left is a set of equations. Which option belongs to the same set? 
A
B
C
D
Step 1: Analyze the relationship between each symbol. Note that all equations follow a pattern, where certain operations involving symbols result in a specific value.
Step 2: Using the first equation, we observe that \( \triangle \times \) leads to \( \square \). Next, apply the operations to each option and identify the one that maintains consistency with the pattern in the original set of equations.
Step 3: Option (C) correctly follows the pattern from the original equations.
Shown below is an arrangement of closely stacked spheres. Assume each one to be in contact with its immediate neighbour. What is the total number of points where the spheres touch each other?
The 12 musical notes are given as \( C, C^\#, D, D^\#, E, F, F^\#, G, G^\#, A, A^\#, B \). Frequency of each note is \( \sqrt[12]{2} \) times the frequency of the previous note. If the frequency of the note C is 130.8 Hz, then the ratio of frequencies of notes F# and C is:
The words given below are written using a particular font. Identify the digit that does not belong to the same font.

