UPSC
Government Jobs Exams
Logical Reasoning
Seating Arrangement
'how to make sum 30 using 1,3,5,7,9,11,13,15.
any 5 numbures must be in use and you can
repeat the numbures?
Read Solution (Total 13)
-
- 11+9+5+3+1+1=30
- 10 years agoHelpfull: Yes(20) No(14)
- You cannot get even number by adding 5 odd numbers. I dont know whether i am right or wrong, check my solution:
15^1 + 5 + 5 + 5 = 30 - 10 years agoHelpfull: Yes(13) No(12)
- 3+7+5+15=30
- 10 years agoHelpfull: Yes(7) No(7)
- (1^3)+9+5+15=30
- 10 years agoHelpfull: Yes(6) No(5)
- 3!+11+13=30
- 9 years agoHelpfull: Yes(6) No(5)
- 3!+3!+3!+3!+3!
- 10 years agoHelpfull: Yes(0) No(1)
- 1+9+5+7+3+5=30
- 9 years agoHelpfull: Yes(0) No(0)
- a) 3!+1+3+11+9=30
b) 3!+1+3+15+5=30
c) 3!+1+3+13+7=30
where,
3! -> Factorial of 3 -> 1*2*3=6
Summing up, we get 30. - 9 years agoHelpfull: Yes(0) No(0)
- 9+7+1.5+3.5+9 = 30
- 9 years agoHelpfull: Yes(0) No(0)
- Please read the catch-phrase
"repetition is allowed" where the trick lies.
that means on the top of 5 digits, a no. can be repeated
11+9+5+3+1....+1 - 9 years agoHelpfull: Yes(0) No(0)
- we can never arrive at 30 by adding 5 odd numbers becoz the sum of 5 odd numbers is always odd. But here 30 is even . SO IMPOSSIBLE!!!!!!!!!!!!!! We can either add 4 odd numbers or 6 odd numbers to arrive at 30.
Eg: 13+7+7+3=30 (adding 4 numbers)
or 7+3+3+3+5+9=30 (adding 6 numbers)
or 15+15=30 (adding 2 numbers)
Which means we can add only even number of odd numbers to get the sum even i.e 30. - 9 years agoHelpfull: Yes(0) No(0)
- 1,3,7,9 and 5 twice
1+3+7+9+5+5=30 - 9 years agoHelpfull: Yes(0) No(1)
- 3+5+7+15ˆ1=30
- 5 years agoHelpfull: Yes(0) No(0)
UPSC Other Question