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# A palindrome is a number that reads the same forward and backward. For

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A palindrome is a number that reads the same forward and backward. For  [#permalink]

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24 Jan 2020, 06:20
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Difficulty:

45% (medium)

Question Stats:

43% (01:07) correct 57% (00:48) wrong based on 7 sessions

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A palindrome is a number that reads the same forward and backward. For example - 1331. How many 4-digit palindromes can be formed using digits - 1, 3, 5, 7, and 9?

A. 10
B. 20
C. 25
D. 35
E. 45

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Re: A palindrome is a number that reads the same forward and backward. For  [#permalink]

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24 Jan 2020, 06:25
1
5*5*1*1= 25.......??

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Re: A palindrome is a number that reads the same forward and backward. For  [#permalink]

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24 Jan 2020, 06:30
aish5063 wrote:
5*5*1*1= 25.......??

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Re: A palindrome is a number that reads the same forward and backward. For  [#permalink]

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24 Jan 2020, 06:44
1st and 4th digit will be same... and 2nd and 3rd will be same.. so just choose 1st and 2nd digits.

repetition is allowed for 1st and 2nd spot
for 1st digit we have five options available.. and we have 5 options for second digit as well.
3rd and 4th will be same so...1,1 option for both spots...
that's why: 5*5*1*1

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Re: A palindrome is a number that reads the same forward and backward. For   [#permalink] 24 Jan 2020, 06:44
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