The tricky question

Algebra Level 2

◻➕◻➕◻➕◻➕◻=30 Fill the boxes using (1, 3, 5, 7, 9, 11, 13, 15) U can repeat the numbers..This question came in UPSC Final Exams held in Dec '13...... You will be glad to note that only Gaurav Agarwal (IAS Topper) could solve it.

6 + 6 + 6 + 6 + 6 5 + 5 + 5 + 5 + 5 + 5 3 + 5 + 7 + 9 + 3! 1 + 4 + 5 + 5 + 15

Souvik Mondal by Souvik Mondal , 22, India

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1 solution

Sandeep Rathod
Nov 21, 2014

Since the answer is even , and we are given only odd numbers and odd places , thus we are confirmed that only 4 places can be filled with those odd numbers , now for an even number the only possible path left for us is factorial notation therefore 3 + 5 + 7 + 9 + 3!

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3+5+7+9+3=27 not 30

Gaurav Agarwal - 6 years, 5 months ago

there are only 9 gaps. How can you fill 9 gaps with 10 digits (5 numbers, 4 Plus sign, 1 factorial)??

Romel Bhattacharjee - 6 years, 6 months ago

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and what's wrong with "6 + 6 + 6 + 6 + 6".

Romel Bhattacharjee - 6 years, 6 months ago

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We have to fill the boxes using the digits 1, 3 , 5 ,7,9,11,13,15 only

sandeep Rathod - 6 years, 6 months ago

where are the 9 gaps. we have to fill the 5 squares with odd numbers to get an even number

sandeep Rathod - 6 years, 6 months ago

did upsc topper gaurav agarwal solved it without options .

veeresh pandey - 3 years, 1 month ago

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