Find the odd man out. 5, 10, 40, 81, 320, 640, 2560  Choose the most appropriate option.
A) 40 B) 81 C) 320 D) 2560 E) 640
Explanation :   Alternatively 2 and 4 are multiplied with the previous terms   5   5 × 2 = 10   10 × 4 = 40   40 × 2 = 80   80 × 4 = 320   320 × 2 = 640   640 × 4 = 2560   Hence, 81 is wrong. 80 should have come in place of 81.   Answer : Option 81
<result>B</result>
Find the odd man out. 5, 10, 40, 81, 320, 640, 2560