Question

i ?????????=30 Fill the boxes using (1, 3, 5, 7, 9, 11, 13, 15) U can also repeat the numbers. This question came in UPSC Final Exams held in Dec 2013.

Answer 1

Answer:

3! + 11 + 15 or

3! + 5 + 7 + 1 + 11

Step-by-step explanation:

If there are three boxes then choose 3! or 3 factorial with two more numbers summing to 24.

If there are five boxes then choose four other. odd numbers to sum to 24 like 1 11 5 and 7 ..

Have to use 3! as one number in the sum has to be an even number.

Answer 2

• Odd numbers don't add up to give you an even number. It is possible only in case of factorial.

3!+1+3+13+7=30  

3!+3!+3!+3!+3!=30

11+1+3+15=30

3! + 15 + 9 = 30