Directions for the next 5 (five) items :
Each item in this section contains a question followed by two statements. Answer each item using the following instructions and mark your response on the Answer Sheet accordingly.
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?
m is not a prime number.
The sum of the digits of m is greater than 5.
- AOption (a)
Select this option if the question can be answered using one of these statements alone, but cannot be answered using other statement
- BOption (b)
Select this option if the question can be answered using either statement alone
- COption (c)
Select this option if the question can be answered using both the statements together, but cannot be answered using either statement alone
- DOption (d)
Select this option if the question cannot be answered even using any of the statements
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Correct answer
Select this option if the question can be answered using one of these statements alone, but cannot be answered using other statement
Why this answer is correct
Shortcut Trick
Possible sums m without 5-coin: 1+2+10=13, 1+2+20=23, 1+10+20=31, 2+10+20=32.
Check Statement 2: Sum of digits for these is {4, 5, 4, 5}. None are > 5. All sums with digit sum > 5 must contain a 5-coin. (Sufficient)
Check Statement 1: m=32 is not prime and has no 5-coin, while m=8 is not prime and has a 5-coin. (Insufficient)
∴ The correct answer is statement 2 alone is sufficient.
Alternate Method
Given: Coins = {1, 2, 5, 10, 20}. Number of coins = 3. Total amount = m.
Step 1: Analyze Statement 1 (m is not a prime number)
⇒ Composite values of m: {8, 16, 26, 27, 32, 35}
⇒ If m = 32 (2 + 10 + 20), X does not have a 5-coin.
⇒ If m = 8 (1 + 2 + 5), X has a 5-coin.
⇒ Statement 1 alone is not sufficient.
Step 2: Analyze Statement 2 (Sum of digits of m > 5)
⇒ m values with digit sum > 5: {8, 16, 17, 26, 27, 35}
⇒ Case 1: m = 8 → {1, 2, 5}
⇒ Case 2: m = 16 → {1, 5, 10}
⇒ Case 3: m = 17 → {2, 5, 10}
⇒ Case 4: m = 26 → {1, 5, 20}
⇒ Case 5: m = 27 → {2, 5, 20}
⇒ Case 6: m = 35 → {5, 10, 20}
⇒ Every possible case contains a 5-denomination coin.
⇒ Statement 2 alone is sufficient.
∴ The correct answer is statement 2 alone is sufficient.
Additional Information
Data Sufficiency Logic
If one statement leads to a unique 'Yes' or 'No' answer, it is sufficient. If it leads to both possibilities, it is insufficient.
Prime and Composite Numbers
A prime number has exactly two factors (1 and itself). A composite number (not prime) has more than two factors.
Sum of Digits Property
The sum of digits is often used in divisibility rules (e.g., divisibility by 3 or 9) and can help uniquely identify sets of numbers in constrained problems.