Aptitude - Odd Man Out and Series - Discussion
Discussion Forum : Odd Man Out and Series - Missing No. (Q.No. 1)
Directions to Solve
Insert the missing number.
1.
16, 33, 65, 131, 261, (....)
Answer: Option
Explanation:
Each number is twice the preceding one with 1 added or subtracted alternatively.
So, the next number is (2 x 261 + 1) = 523.
Discussion:
12 comments Page 1 of 2.
Supriya said:
4 years ago
16+16 = 32 + 1 = 33.
33+33 = 66 - 1 = 65.
65+65 = 130 + 1 = 131.
131+131 = 262 - 1 = 261.
261+261 = 522 + 1 = 523.
Hence 523 is the answer.
33+33 = 66 - 1 = 65.
65+65 = 130 + 1 = 131.
131+131 = 262 - 1 = 261.
261+261 = 522 + 1 = 523.
Hence 523 is the answer.
(7)
Kartik sharma said:
8 years ago
See, if we square the number and then divide by half of it and add 1 and subtract 1 in alternative way wise we will get the number.
Method :-
16 * 16 = 256 , 256 / 8 = 32 , 32+1 = 33.
33 * 33 = 1089 , 1089 / 16.5 = 66 , 66 -1 = 65.
261 * 261 = 68121 , 68121 / 130.5 = 522 , 522 + 1 = 523.
Method :-
16 * 16 = 256 , 256 / 8 = 32 , 32+1 = 33.
33 * 33 = 1089 , 1089 / 16.5 = 66 , 66 -1 = 65.
261 * 261 = 68121 , 68121 / 130.5 = 522 , 522 + 1 = 523.
(1)
Fcd said:
1 decade ago
So that way I calculate the number 131*2+1=263 here I got 263 what's the correct answer?
Pooja said:
1 decade ago
Here
16*2+1=33
2*33-1+65
2*65+1=131
2*131-1=261
2*261+1=523
16*2+1=33
2*33-1+65
2*65+1=131
2*131-1=261
2*261+1=523
Sou said:
1 decade ago
Adding and subtracting 1 alternatively
so
(2*16+1)=33
(2*33-1)=65
(2*65+1)=131
(2*131-1)=261
(2*261+1)=523
Therefore 523 is correct.
so
(2*16+1)=33
(2*33-1)=65
(2*65+1)=131
(2*131-1)=261
(2*261+1)=523
Therefore 523 is correct.
Dolly said:
1 decade ago
Then the answer could b even 521 as 2*261-1 = 521, when we can sub 1 from the above one that is 2*131-1.
Why not from 261?
Why not from 261?
Bipin parida said:
10 years ago
16*2+1 = 33.
2*33-1 = 65.
2*65+1 = 131.
2*131-1 = 261.
2*261+1 = 523.
2*33-1 = 65.
2*65+1 = 131.
2*131-1 = 261.
2*261+1 = 523.
123 said:
9 years ago
Yes, 523 is the correct answer.
B.T.L.Aruna said:
6 years ago
16*2+1 = 33.
2*33-1 = 65.
2*65+1 = 131.
2*131-1 = 261.
2*261+1 = 523.
2*33-1 = 65.
2*65+1 = 131.
2*131-1 = 261.
2*261+1 = 523.
Danny said:
6 years ago
If each number is twice the preceding number with 1 added or subtracted then why isn't the answer 521?
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