APTITUDE | ARITHMATICAL | ODD MAN OUT AND SERIES | FIND OUT THE WRONG NUMBER IN EACH SEQUENCE 1

DIRECTIONS : Find out the wrong number in the series

1.	125, 106, 88, 76, 65, 58, 53
	A.   125	B.   106
	C.   88	D.   76

Solution

88. Go on subtracting prime numbers 19, 17, 13, 11, 7, 5 from the numbers to get the next number. So, 88 is wrong.

2.	5, 15, 30, 135, 405, 1215, 3645
	A.   3645	B.   1215
	C.   405	D.   30

Solution

30. Multiplly each term by 3 to obtain the next term. Hence, 30 is a wong number.

3.	3, 8, 15, 24, 34, 48, 63
	A.   15	B.   24
	C.   34	D.   48

Solution

34. The difference between consecutive terms are respectively 5, 7, 9, 11 and 13. So, 34 is wrong.

4.	3, 4 , 10 , 32 , 136 , 685 , 4116
	A.   32	B.   136
	C.   685	D.   4116

Solution

136. 3*1+1=4, 4*2+2=10, 10*3+3=33, 33*4+4=136.

5.	1, 1, 2, 6, 24, 96, 720
	A.   720	B.   96
	C.   24	D.   6

Solution

96.