Maths question from Laboratory Attendant exam, 2026 by JKSSB
A card is drawn at random from a pack of 100 cards numbered 1 to 100. The probability of drawing a number which is a square, is
Last updated Jun 13, 2026
Correct Answer:
Option A —
1/10
To find the probability of drawing a perfect square, we can look at the total number of cards and the number of perfect squares within that range.
Step-by-step Explanation:
Total Outcomes: There are 100 cards in total, numbered from 1 to 100. So, the total number of possible outcomes is 100.
Favorable Outcomes: We need to count how many numbers between 1 and 100 are perfect squares (numbers that result from multiplying an integer by itself). These numbers are:
1 times 1 is 1
2 times 2 is 4
3 times 3 is 9
4 times 4 is 16
5 times 5 is 25
6 times 6 is 36
7 times 7 is 49
8 times 8 is 64
9 times 9 is 81
10 times 10 is 100
Counting them up, there are exactly 10 perfect squares from 1 to 100.
Calculate Probability: Probability is calculated by dividing the number of favorable outcomes by the total number of outcomes.
This gives 10 out of 100 (10/100).
Simplifying this fraction by dividing both numbers by 10 gives 1 out of 10 (1/10).
Answer verified by Quintessence Classes faculty — Karan Nagar, Srinagar.
