Civil Services Prep

Prelims 2026 · CSAT / Quantitative Aptitude · Question 1

X receives three coins of different denominations : 1, 2, 5, 10 and 20. If the total amount received by X is m, does X receive a coin of denomination 5?<br/>Statement I :<br/>m is not a prime number.<br/>Statement II :<br/>The sum of the digits of m is greater than 5.<br/>

  1. Select this option if the question can be answered using one of these statements alone, but cannot be answered using other statement
  2. Select this option if the question can be answered using either statement alone
  3. Select this option if the question can be answered using both the statements together, but cannot be answered using either statement alone
  4. Select this option if the question cannot be answered even using any of the statements

Answer

Select this option if the question can be answered using one of these statements alone, but cannot be answered using other statement

Possible 3-coin sums from {1,2,5,10,20} are 8, 13, 23, 16, 26, 31, 17, 27, 32, 35. With coin 5: 8,16,17,26,27,35. Without coin 5: 13,23,31,32.
Statement I: m is not prime. Non-prime sums include 8,16,26,27,32,35. Since 32 is possible without coin 5, this is not sufficient.
Statement II: digit sum of m > 5. This holds for 8,16,17,26,27,35 only, and all these include coin 5. So this alone is sufficient.

  1. For two distinct real numbers x and y, which of them is bigger? Statement I : x^2 Statement II : y
  2. If x and y are integers, then is x even? Statement I : x^2 y^2 is even. Statement II : 1 + x^2 + y^2 is odd.
  3. X is a collection of certain odd numbers whereas Y is a collection of certain even numbers. T consists of the…
  4. If x, y and z are integers, each greater than 1, then is x a prime number? Statement I : xy^2 = 116 Statement…
  5. Which of the following conclusions are valid? 1. Seven Sanskriti Angans, representing different regions of…
  6. Which one of the following statements is **not** correct? **Passage:** 'Kalagram', the cultural village set up…