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A palindrome is a number, such as 32123, that reads the same forward

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A palindrome is a number, such as 32123, that reads the same forward  [#permalink]

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New post 17 Dec 2018, 00:52
1
3
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

70% (01:25) correct 30% (01:56) wrong based on 62 sessions

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Re: A palindrome is a number, such as 32123, that reads the same forward  [#permalink]

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New post 17 Dec 2018, 02:07
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Bunuel wrote:
A palindrome is a number, such as 32123, that reads the same forward and backward. How many palindromes are there between 100 and 1000?

A. 81
B. 88
C. 89
D. 90
E. 91



0 to 9 = 10 digits

palindromes = 9*10*1*1 = 90 IMO D
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Re: A palindrome is a number, such as 32123, that reads the same forward  [#permalink]

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New post 30 Dec 2018, 02:35
1
The number has 3 figures: XYX - the first X can be from 1-9, Y can be from 0-9, the 2nd X must have the same value as the first X, so only 1 possibility. 9*10*1 = 90 = D
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Re: A palindrome is a number, such as 32123, that reads the same forward  [#permalink]

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New post 30 Dec 2018, 09:22
Bunuel wrote:
A palindrome is a number, such as 32123, that reads the same forward and backward. How many palindromes are there between 100 and 1000?

A. 81
B. 88
C. 89
D. 90
E. 91


The question is basically asking for the number of 3 digit palindromic numbers.

__ __ __ For the 1st blank there are 9 possibilities. (Since, 1st digit cannot be zero)
For the 2nd blank there are 10 possibilities. (the middle digit does not matter - will remain the same forwards and backwards)
For the 3rd blank there is only 1 possibility. (Since the 3rd digit must be the same as the 1st digit)

Next, multiply the number of possibilities for each digit: 9*10*1 = 90. OA: D
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Re: A palindrome is a number, such as 32123, that reads the same forward   [#permalink] 30 Dec 2018, 09:22
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A palindrome is a number, such as 32123, that reads the same forward

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