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A number that is a palindrome reads the same way forwards and backward

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A number that is a palindrome reads the same way forwards and backward  [#permalink]

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New post 27 Nov 2019, 02:20
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A
B
C
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E

Difficulty:

  35% (medium)

Question Stats:

65% (01:27) correct 35% (01:44) wrong based on 34 sessions

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A number that is a palindrome reads the same way forwards and backwards. For example, 3113 and 7447 are palindromes. Let n be the product of all 4-digit palindromes. What is the unit’s digit of n?

A. 0
B. 2
C. 4
D. 5
E. 8
Spoiler: OA

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Re: A number that is a palindrome reads the same way forwards and backward  [#permalink]

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New post 27 Nov 2019, 04:57
Bunuel wrote:
A number that is a palindrome reads the same way forwards and backwards. For example, 3113 and 7447 are palindromes. Let n be the product of all 4-digit palindromes. What is the unit’s digit of n?

A. 0
B. 2
C. 4
D. 5
E. 8


A 4-digit palindrome can end in all the digits from 1-9 and NOT in 0 (E.g: 0550 is not a 4-digit number!)

Last digits of palindromes = (1, 2, 3, 4, 5, 6, 7, 8, 9}

Product will ALWAYS end in 0 (Since 5 & even numbers 2,4 are there etc.)

IMO Option A
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Re: A number that is a palindrome reads the same way forwards and backward   [#permalink] 27 Nov 2019, 04:57
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A number that is a palindrome reads the same way forwards and backward

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