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Select the odd number from the given alt...

Select the odd number from the given alternatives :

A

25

B

49

C

81

D

121

Text Solution

Verified by Experts

The correct Answer is:
C
Except the number 81, all other numbers are equares of Prime Numbers.
`25 = 5 xx 5 `
`49 = 7 xx7` `121 = 11 xx 11`
But, `81 = 9 xx9`
The number 9 is not a Prime Number It is square of a Prime Number it self .
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