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Find missing number- 9,19,40,….,170

December 28, 2014 by Subbu Raj 2 Comments

Number Puzzle #126

Find missing number in the series 9,19,40,?,170

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If we see Tn = 2*Tn-1 + n
T0 = 9
T1 = 2*9 +1 = 19
T2 = 2*19 +2 = 40
T3 = 2*40 + 3 = 83
T4 = 2*83 + 4 = 170

1,2,5,7,11,-,17

December 12, 2014 by Siva Subramanian 10 Comments

Number Puzzle #125

find the missing number in below series
1,2,5,7,11,??,17

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It is a prime number series

10,11,19,28,??,117

November 24, 2014 by puzzler 7 Comments

Find the missing number in the series
10,11,19,28,??,117

This puzzle is courtesy one of our readers, shared via WhatsApp

Check your answer:-

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pattern goes like this add 1 square, 2 cube, 3 square, 4 cube, 5 square….so on

First number is 10, then next number is 10 + 1^2 =>11
next number 11 + 2^3 => 19
next number 19 + 3^2 => 28
next number 28 + 4^3 => 92
next number 92 + 5^2 => 117

Credit to the answer goes to Rahul

Number Puzzle #123

November 1, 2014 by puzzler 7 Comments

Guess the number in middle of the triangle

7 5 3 => 26

2 1 3 => 5

8 6 2 => 44

4 9 5 => ?

Check your answer:-

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let 3 numbers be a , b , c s.t. c>b>a
then here (b)x(c)-(a)^2 = output
In short: Multiplication of 2 highest numbers and then subtract by square of the smaller number.
so 7 5 3 ; 7*5-9=26
2*3-1 =5
8*6-4=44
9*5-16=29

Thus 29 is the answer.

answered by Anshul Singh

Number Puzzle #122

October 29, 2014 by puzzler 5 Comments

Which number should replace the question mark ?

Number Puzzle #122

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2+1=3
3+1=4
7+3=10
13+3=16
………..
0+1=1
2+1=3
2+3=5
10+3=13

answer by sakshi

If 3/20 = 1/10+1/20

October 3, 2014 by Rajshree goel 6 Comments

Number Puzzle #121

If 3/20=1/10+1/20

3/5=1/5+1/5+1/5

Then, 7/10=????

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Ans.7/10=1/5+1/2
How?
Trick is to make dividend as 1 in minimum possible additions.

so we should try to write 7/10 as 1/x + 1/y + 1/z …..

we can easily see that x = 5, y = 2 will be enough.

If 3 = 5, 5 = 3, 7 = 4

September 29, 2014 by Clyde Guzman 11 Comments

Number Puzzle #120

IF 3 =5
5= 3
7 = 4
8 = 6
10 = 7
11 = 8
Then 12 = ?

Check your answer:-

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Answer is 8, (answer by Omi Guy on facebook)
Here left is month number and right side represents the number of characters in the month name.
thus number of character’s in 12th month, i.e. in december are 8