Question : Directions: Three of the following number triads are alike in some manner and one is different. Select the odd number triad.
(NOTE: The second and third numbers in the given number triads are formed by performing a certain operation on the first number. The same operation is followed in all the number triads except one). Find that odd number triad.
Option 1: 20 : 400 : 200
Option 2: 9 : 81 : 45
Option 3: 13 : 169 : 84.5
Option 4: 25 : 625 : 312.5
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Correct Answer: 9 : 81 : 45
Solution : Let's check the options –
First option:
20 : 400 : 200; 20
2
= 400 and 400 ÷ 2 = 200
Second option:
9 : 81 : 45; 9
2
= 81 and 81 ÷ 2 = 40.5 ≠ 45
Third option:
13 : 169 : 84.5; 13
2
= 169 and 169 ÷ 2 = 84.5
Fourth option:
25 : 625 : 312.5; 25
2
= 625 and 625 ÷ 2 = 312.5
So, the second option is different from the other three options as here 81 ÷ 2 = 40.5 ≠ 45 . Hence, the second option is correct.
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