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Question

10 8 13 35 135 671 4007

A) 8
B) 671
C) 135
D) 13
E) 35

Solution

Answer (b)

10, 8, 13, 15, 35, 135, 671, 4007

10 x1 – 2 = 8

8 x2 – 3 = 13

13 x3 – 4 = 35

35 x4 – 5 = 135

135 x 5 – 6 = 669

669 x 6 – 7 = 4007

So wrong number in the series is 671


						 
Answer (b)
10, 8, 13, 15, 35, 135, 671, 4007
10 x1 – 2 = 8
8 x2 – 3 = 13
13 x3 – 4 = 35
35 x4 – 5 = 135
135 x 5 – 6 = 669
669 x 6 – 7 = 4007
So wrong number in the series is 671

Solution

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