# Secondary school math 5+3 pts Solve this.. ◻➕◻➕◻➕◻➕◻=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 '13...... You will be glad to note that only Gaurav Agarwal could solve it.

2
by tusharmohite

• Brainly User
2014-11-25T22:29:30+05:30
The answer  is 3!+11+11+1+1.......here 3! means 3X2X1
or else u can say that 3 weeks +7days+1 day+13 hours+11 hours
9+11+9+1=30
2014-11-25T23:24:33+05:30

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Gaurav Agrawal answered very intelligently and using his imagination.         -- really for this question is asked so many times.. all credit goes to him.

you can answer this question in many ways using the factorial function.

3! + 3! + 3! + 3! + 3!      = 30
3! + 1 + 3 + 9 + 11          = 30
1 + 5 + 7 + 3! + 11               = 30
3! + 3! + 3! + 11 + 1             = 30
3! + 3! + 11 + 5 + 1               = 30
11+ 1 + 1 + 3! + 11              = 30
15 + 3 + 3 + 3 + 3!              = 30
13 + 1 + 1 + 9 + 3!            = 30
13 + 1 + 3 + 7 + 3!            = 30
13 + 5 + 3 + 3 + 3!            = 30

If  one can use /, * , exponent and other operators, then you can get more answers too.  Question does not say anything about the operators.

5 * 3 + 13 + 1 + 1 = 30
13 + 15 + 3! - 3 - 1 =    30
15! / 13! / 7 * 1 * 1  =  30
5!  / 3!  + 1 * 3 + 7 = 30
7 * 5  - 3 - 1 - 1  =  30
9 * 7 / 3 + 9 * 1 =  30
3³ + 1 + 11 - 13 * 1  = 30
5³ / 15 * 3 + 5 * 1 = 30
3 * 15 - 11 - 3 - 1 = 30

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You need one operator for which the result is an even number with an input being an odd number.  Factorial is one.  Probably there are other operators too.