CUET PG 2026 — Computer PYQ

Solution

To find the total number of elements in an array when the index range is given, we use the concepts of Upper Bound ($UB$) and Lower Bound ($LB$).

1. Definitions:

• Lower Bound ($LB$): The index of the first element in the array.

• Upper Bound ($UB$): The index of the last element in the array.

2. The Formula:

The number of elements (Length) is calculated by subtracting the lower bound from the upper bound and then adding $1$ to include both endpoints.

3. Example for verification:

Suppose an array starts at index $10$ and ends at index $20$.

• $LB=10$

• $UB=20$

• $\text{Length}=20-10+1=11$

If we simply did $20-10$, we would get $10$, which misses the first element. Therefore, adding $1$ is necessary.

Final Answer:

The correct option is (c) Upper bound - Lower bound + 1.