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/>
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.