I am uploading here what I wrote in the General Studies paper 1 of 2013 UPSC mains exam. This is just from memory and may not be accurate. You are most welcome to criticize/add to/suggest alternate answers :-) I am only putting up a link here because the formatting of wordpress leaves much to desire.

Click here to download Paper 1.

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(15-13)+(11-1)+(9-3+5+7)=30

All the given no’s used.

right answer only your

right answer only your

jaya chandra

It’s not a fair answer

I spent 40, I am sure I solved it …

( 9 multiply by 3) + ( 5-3 ) + 1 = 30

27 + 2 + 1 = 30

30 = 30

15-5 + 15-5 + 15-5

30

15+15+1=30+1

7+3+11+5+(3+1).=30

15 15 0

or else 15+11+(3+1) =30

ans 15 14 3! =30

It is not written for using operators like -,+ or any other in the box itself so the

question is not correct. Using minus in the box itself is not fair

3.7+13.15+13.15

My solution: 15 15 empty

right answer ,

we can use numbers repeatedly ,

they didn’t say that we have to use all the boxes.

11+13+3!=30

the ans is,

(3+1) in first box 11 in second box and 15 in last box,,…as in question it is said that i can use all the things i.e., (1,3,5,7,9,11,13,15) but i can repeat only numbers,so the correct ans is this……

the ans is,(3+1) in first box 11 in second box and 15 in last box,,…as in question it is said that i can use all the things i.e., (1,3,5,7,9,11,13,15) but i can repeat only numbers,so the correct ans is this……

(1,11) + (3,13) + (5,15) =30

Difference b/w these values is 10. So,

(10) +(10)+(10) = 30

I believe this is a pretty impressive answer..

11+13+1

3!+9+15

3+13+15=30

In base9, 3 is 3

In base 9, 13 is 14

In base 9, 15 is 16

And in base 9 , 30 is 33

For me, this is the most elegant solution. Wanderful, Fernando .

ans is ‘No’…

1DAY{24 HRS}+5 HRS+1 HRS=30

13.7 + 13.3 + 3 ???

Each box repeat no 1 infront of the box. 10+10+10=30

the answer is 7(1,3) + 7,9 + 13 = 30 (Why ?)

Считаю что это самый правильный ответ

3(+5)+15

3(+5)+15=30

3! 9 15=30

where, 3!=3×2×1=6

1(da)+1(da)+1(da)=3 (da). =30

The answer is ”not possible” as it is given only odd nos ant the resultant is even. As it is state that “the sum of THREE ODD NUMBER is ODD number itself. Hence the answer is “not possible”.

Hi,

For me the solution is

15+13+ log3 9= 15+13+2=30

Gaurav …how dare u..? Do u think u r genius. Try to fill the boxes at first if u can give the right answer. Otherwise u will get -0.33 ok….

(6+11+13=30 )

:-!

(15-13)+15+13=30

(1+1)+13+15=30

[15+1]+[11]+[3]=30

GAURAV AGARWAL PLEASE SHOW ANSWER

15+15 =30. There is no condition to fill all the three boxes

9+9+11!=30There is no contition to fill three box

(9+1) (13-3) (15-5) so simple