### #1 - Hard Number Sequence Riddle

Find the next number in the sequence

5 12 24 36 ?

50

sum of consectuve prime numbers
(2+3 , 5+7 , 11+13 , 17+19 , 23+27)

### #2 - Pyramid Number Puzzle

The below is a number puzzle. It should be read left to right, top to bottom.
1
1 1
2 1
1 2 1 1
1 1 1 2 2 1
? ? ? ? ? ?
? ? ? ? ? ? ? ?
Question 1: What is the next two rows of numbers?

Popular Number Sequence Puzzle
3 1 2 2 1 1
1 3 1 1 2 2 2 1

Line 1 is 'Two ones' (2 1)
Line 2 then becomes 'One two, and one one' (1 2 1 1)
Line 3 therefore is 'One one, one two and two ones' (1 1 1 2 2 1)
Line 4 is 'Three ones, two twos and one one' (3 1 2 2 1 1)
Line 5 is 'One three, one one, two twos and two ones' (1 3 1 1 2 2 1 1)

### #3 - Find The Missing Number

Find the missing number in the image below ?

6

sum of opposite number is 21

### #4 - Hard Number Series Aptitude Riddle

What is the next number in the series.

15 29 56 108 208 ?

400

Explanation:
15
2*15-1 => 29
2*29-2 => 56
2*56-4 => 108
2*108-8 => 208
2*208-16 => 400

### #5 - Number Series Riddle

Find The Next Number in this series ?
1, 2, 6, 42, 1806 ?

3263442

each number is multiplied by the number+1
1x2 = 2
2x3 = 6
6x7 = 42
42x43 = 1806
1806x1807 = 3263442

### #6 - Maths Picture Puzzle

Replace the question mark with the correct number.

4

6*3 equals 18
7*9 equals 63
6*4 equals 24
7*6 equals 42, ? shud b replcd by 4."

### #7 - Number Series

What is the next number in this series, 1, 11, 21, 1211, 111221 , 312211 ?

Next in sequence is 13112221.

This series describes each number that came before it:
1 [One]
11 [One One]
21 [Two One(s)]
1211 [One Two and One One(s)]
111221 [One One, One Two, and Two One(s)]
312211 [Three One(s), Two Two(s), and One One]

The next number in the series is:
13112221 [One Three, One One, Two Two(s), Two One(s)]

### #8 - What Number Should Replace The Question

What Number Should Replace The Question Mark In The Circle Below ?

17

It is the sum of the two digits(9 + 8) in opposite quadrant.

### #9 - Next Number In Series

What letter is next in this sequence?
M, A, M, J, J, A, S, O,__

N for November!

### #10 - January Series Puzzle

Find The Next Number In Series ?
100 365 24 60 ?
*Hint : Timing is everything

60. 100 years in a century, 365 days in a year, 24 hours in a day, 60 minutes in an hour, & 60 seconds in a minute.