Question

What is the missing number in this series?
987, 251, 369,872,513, ?

Answer 1

I think the missing number should be 69X. the last 2 digits for the 1st number in the series are the 1st 2 digits of the 4th number in the series, the last 2 digits for the 2nd number in the series are the 1st 2 digits of the 5th number in the series. and so on.

Answer 2

it's 698

Answer 3

haha I guess so if you take the series as a cycle which will repeat 987,251... again.

Answer 4

yep i think so :)

Answer 5

thankyou!
Will you help me with another one?
What is the missing number in this series?
53472 2435, 342, ?

Answer 6

u get 2435 by removing 2nd digit from last nd writing the number in reverse....nd 342 by removing 1 digit from last....

Answer 7

so for the next one which number do i remove?

Answer 8

i thnk the next number shud be 243....

Answer 9

the options given for the answers are
a) 23
b) 302
c) 32
d) 82
e) 22

Answer 10

i thnk it shud be 23 :P

Answer 11

I guess the most accurate answer would be 23. A digit is removed along the series and the number is listed in reverse order.

Answer 12

hey @glgan1 check the other question http://openstudy.com/users/shirleyx#/updates/4fbf52fae4b0dd370c7724ec

Answer 13

haha the other questions have been answered already, its just that the macrob entrance exam questions require a lot of logic and i can't find any patterns!

Answer 14

really wat's the answer for that qn
http://openstudy.com/users/shirleyx#/updates/4fbf52fae4b0dd370c7724ec

Answer 15

vm I think i found it. if you take the middle 2 digits and multiply by each other you will get the outer 2 digits. lets say 1826. 8x2=16. so you can see that 1 is placed on the 1st digit and 6 is placed on the 4th. 2731. 7x3=21. and you will find out that 7984 is the wrong 1. <<quoted from glgan1 :)

Answer 16

lucky last question...i hope ><
What is the missing number in this series?
7 8 9 10 12 14 16 20 21 28 ?

Answer 17

what's the macrob test @shirleyx ? I think I will fail it LOL

Answer 18

the entrance exam to a selective girls school yr 9-12 :) can you answer the question? ^^

Answer 19

too much for 9-12

Answer 20

i know, but its for nerds and math prodigies, haha as you can tell I'm not one of them!

Answer 21

wow great..... http://openstudy.com/users/shirleyx#/updates/4fbf52fae4b0dd370c7724ec
about that :P

Answer 22

is it 27? just look at the 1st 3rd 5th 7th numbers....their differences inccrease by 1 along the series. and for 2nd 4th 6th numbers.... their differences increase by 2 along the series.

Answer 23

i'm 19 and I can't even solve this type of question. you must be a genius.XD

Answer 24

i m 18 :) yep she s genius :)

Answer 25

im not! I'm actually stuck on a lot of the questions! but I'm advanced for my age..doing methods and I'm a lot younger than you..

Answer 26

looooooooooooool ^_^

Answer 27

Work hard then. :) anyway do you understand the method for the last question?

Answer 28

What is the missing number in this series?
7 8 9 10 12 14 16 20 21 28 ? << nope hahah

Answer 29

oh wait, i get it now!

Answer 30

so 7-9 is two, then 9-12 is three, and so forth?

Answer 31

yes. then 4,5,6....

Answer 32

yep :) awsome again

Answer 33

All the best @shirleyx ....dont worry u l do just fine.....
nd thanks u helped me killin my time

Answer 34

ahaha no problem! it was actually you guys that helped me! if you ever want to kill your time, ill be here, stuck on math questions :)