# Thread: Help with a simple math MCQ

1. ## Help with a simple math MCQ

Q: 71116222631...

A: 32
B:34
C:36
D:37
E39

can anyone solve and explain this to me?

would greatly appreciate it.

and sory if i posted it in the wrong section

2. Originally Posted by Frak
Q: 71116222631...

A: 32
B:34
C:36
D:37
E39

can anyone solve and explain this to me?

would greatly appreciate it.

and sory if i posted it in the wrong section
Hi Frak,

7, 11, 16, 22, 26, 31

7, 7+4=11, 11+5=16, 16+6=22

22, 22+4=26, 26+5=31

There is a pattern.
What value should you add to 31 ?

3. Wow, Archie, I am impressed! How did you manage to make sense out of the original post?

4. Originally Posted by Archie Meade
Hi Frak,

7, 11, 16, 22, 26, 31

7, 7+4=11, 11+5=16, 16+6=22

22, 22+4=26, 26+5=31

There is a pattern.
What value should you add to 31 ?
thanks Italian man

to carry on with the sequence, 31 +6 = 37

is there a formula to figure out the sequence or just common sense/logic?

5. is there a formula to figure out the sequence or just common sense/logic?

At this level, it's more a matter of pattern recognition

A formula could be developed but is just too unwieldy
in terms of spotting the pattern.

6. Originally Posted by Archie Meade
is there a formula to figure out the sequence or just common sense/logic?

At this level, it's more a matter of pattern recognition

A formula could be developed but is just too unwieldy
in terms of spotting the pattern.
I think its called Fibonacci number

Fibonacci number - Wikipedia, the free encyclopedia

7. Hi Frak,

the Fibonacci sequence of numbers is generated in a different way.

The next number in that sequence is found by adding the two numbers before it.

Written as a formula, it is $\displaystyle X_n=X_{n-1}+X_{n-2}$

or $\displaystyle X_{n+2}=X_{n+1}+X_n$

or $\displaystyle X_{n+1}=X_n+X_{n-1}$

and so on.

For your sequence, you could formulate it as something like

$\displaystyle X_{n+1}=X_n+4+[(n-1)\ mod\ 3]$ if n-1 is non-negative,

for $\displaystyle X_1=7$