An algebra problem by Soorya Prakash

Algebra Level 2

Find the next number in the sequence

1 , 3 , 5 , 7 , 9 , 11 , 13 , 15 , 17 , 19 , 31 , 33 , 35 , 37 , 39 … 1,3,5,7,9,11,13,15,17,19,31,33,35,37,39 \dots


The answer is 51.

Soorya Prakash by Soorya Prakash , 21, India

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4 solutions

We are essentially listing down numbers with all digits odd . Hope that cleared any confusion you might've had... Cheers!

8 Helpful 0 Interesting 0 Brilliant 0 Confused
Tarun Singh
Feb 3, 2015

First, write numbers 1,3,5,7,9

Then take first digit of this series which is 1 and write this series again with 1 at tens place 11,13,15,17,19

After this take second digit of original series which is 3 and rewrite with 3 at tens place, 31,33,35,37,39

After this, take 5

51 , 53, 55 ...

answer is 51

1 Helpful 0 Interesting 0 Brilliant 0 Confused

1,3,5,7,9,11,13,15,17,19-31 DIFFERENCE IS 12 THEN 31,33,35,37,39+12=51

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Lawrence Mojado
Feb 16, 2015

Odd numbers 1,3,5,7,9. Then odd number 1 is placed in front of the odd number sequence 1,3,5,7,9. Then the odd number 3 is placed in front of the odd number sequence 1,3,5,7,9. And finally the odd number 5 will be placed in front of the odd number sequence 1,3,5,7,9.

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