## Thursday, June 22, 2017

I was creating Puzzles for Sudoku Mock 21 for Logic Masters India many years back. Some of the puzzles which I created was of the type "Guess the number in the series Sudoku" whose Instructions read as below.
This Sudoku type follow the standard Sudoku rules plus some of the squares will be grayed which can contain numbers from the given series. All but one numbers in the series will be given. Series follows particular pattern. One has to find the missing number by following the series pattern and then solve the Sudoku.
During the testing it was found that it was difficult to find the number in the series. So I decide to drop this puzzle type from the mock test and instead of this all the numbers in the series will be given. Later I thought of creating the Math Brain Teasers from these sequences. Here are these sequence puzzles in which one has to guess the next number in the series.
In these series puzzles, some number series is given which follow certain pattern or sequence. There are few numbers missing in these sequences. One has to deduct what is this sequence all about and then solve it for the missing numbers.
Do put your comments guessing the number which will come next in the series.
 1. Which number replaces question mark in series?

 2. What is next number in series?

 3. What is next in this series?

 4. What comes next in series?

 5. Number series picture puzzle

Here is answer to 1st Brain Teaser Question of post titled "Out of Box Thinking Fun Brain Teasers with answers to Challenge your Mind ". I have hidden this answer to avoid any spoiler. Do select the text below to read the answer.
--------------------------------------
5-->4 and
4 --> 4
Right number represents the number of letters of left number when this number is written in English
e.g TWELVE -->6
SIX --> 3
THREE --> 5 etc.
--------------------------------------

1. Hi Rajesh Series 1 seems to me to be a series about the days of the week. I think the number of letters for the days of the week is given starting from sunday.

Sunday --- 6
Monday --- 6
Tuesday --- 7
Wednesday --- 9
Thursday --- 8
Friday --- 6
Saturday --- 8

So the missing number must be 9 for Wednesday.

Zafer

2. Hi again,

Series 2 seems to me to be a series about pi number. It is known that number pi is given as 3,14159265...
And in this series I think the digits forming number pi is given consecutively as 3 1 4 1 5. So I think the next number will be 9.

Zafer

3. Hi,

I think Series 5 is about digits 1-9. I think the number of letters in the digit names given consecutively as follows:

1 --- one --- 3
2 --- two --- 3
3 --- three --- 5
4 --- four --- 4
5 --- five --- 4
6 --- six --- 3
7 --- seven --- 5
8 --- eight --- 5
9 --- nine --- 4

So the missing numbers seems to be 5,5,5 in this series.

Zafer

4. Hi

Series 3 is a little bit strange. But I have an idea like that:

Each following number starts with the last letter of the previous digit and while searching next digit we go from number to 9 and then from 1 to number. If I apply this rule to the given sequence

2 --- two --- ends with o
1 --- one --- starts with o, ends with e
8 --- eight --- starts with e, ends with t
According to my rule explained above I must put again 2 after 8 since it starts with t. But if the series is decided to be formed by different digits then I must skip 2 and write 3 to the next place since it also starts with t. I have no other idea about this sequence.

Regards,

Zafer

5. If we take the Series 4 it would be very easy if the next number is 7:)) But you told it isn't. So there must be anything else about this series. I again think that it is about the names of digits 1-9. I think the digits whose name ends with an e is given consecutively as follows:

1 --- on'e'
3 --- thre'e'
5 --- fiv'e'
9 --- nin'e'

So I think the last digit must be 9 which is missing.

Regards,

Zafer

6. If we take the Series 4 it would be very easy if the next number is 7:)) But you told it isn't. So there must be anything else about this series. I again think that it is about the names of digits 1-9. I think the digits whose name ends with an e is given consecutively as follows:

1 --- on'e'
3 --- thre'e'
5 --- fiv'e'
9 --- nin'e'

So I think the last digit must be 9 which is missing.

Regards,

Zafer

7. Thanks Zafer,

Most of your answers are right and for Series 5 your logic is quite good but I have something else in mind for Series 5. I will wait for some other people put their guess and logic behind it before I put my logic.

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