One of the number in the series is wrong, find the wrong number in the series :-
Ques 1.
36 , 43 , 49 , 54 , 60 , 61 , 63 , 64
Ques 2.
3 , 10 , 41 , 206 , 1236 , 8660
Ques 3.
12 , 20 , 38 , 42, 56 , 72
Ques 4.
5040 , 840 , 160 , 42 , 14 , 7
Ques 5.
81, 64 , 49 , 35 , 25 , 16
Ques 6.
625 , 125 , 25 , 5 , 0
Ques 7.
25 , 19 , 17 , 13 , 11 ,7
Ques 8.
3 , 10 , 27 , 4 , 16 , 64 , 5 , 25 , 125
Ques 9.
13, 39 , 195 , 1363 , 12285
Ques 10.
2 , 3, 6, 18 , 108 , 1942
solutions :
Ans 1. The difference between two consecutive number is decreasing by 1 at each step.
∴ 58 should be in place of 60.
Ans 2.The sequence followed in this series is :
3 x 3 + 1 = 10
10 x 4 + 1= 41
41 x 5 + 1 = 206
206 x 6 +1 = 1237; and
∴ 1237 shuold be in place of 1236.
Ans 3. The sequence followed in this series is : 3 x 4 = 12
4 x 5 = 20
5 x 6 = 30
6 x 7 = 42
7 x 8 = 56
8 x 9 = 63
∴ 30 should be in place of 38.Ans 4.The numbers in the series are divided by numbers in reverse order starting from 6 to get the next number .
∴ 168 should be in place of 32.
Ans 5. The sequence is the square of the number in decreasing order starting from 9, i.e
92 = 9 x 9 = 81
82 = 8 x 8 = 64
72 = 7 x 7 = 49
62 = 6 x 6 = 64
52 = 5 x 5 = 25
42 = 4 x 4 = 16
∴ 36 should be in place of 35Ans 6 . The number in the series are divided by 5 to get the next number .
∴ 1 should be in place of 0 digit.
Ans 7. Other numbers are prime numbers.
Ans 8. The sequence of the series is formed by a number ,its square , its cube, then the next number is natural order , i.e.,
31 = 3
32 = 3 x 3 = 9
33 = 3 x 3 x 3 = 27
next number :
41 = 4
42 = 4 x 4 = 16
43 = 4 x 4 x 4 = 64
next number :
51 = 5
52 = 5 x 5 = 25
53 = 5 x 5 x 5 = 125
∴ 9 should be in place of 10 .Ans 9. In this series the numbers are multiplied by odd numbers in natural order numbers in natural order starting from 3, i .e.
∴ 1365 should be in place of 1363
Ans 10. The numbers in the series are the product of two numbers preceding it , i.e.
∴ 1944 should be in place 0f 1942.
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