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∙ 9y agoWiki User
∙ 14y ago11, 22, 33, 44, 55, 66, 77, 88, 99.
There are nine two-digit palindromes: 11, 22, 33, 44, 55, 66, 77, 88 and 99.
None. 1221 and 3443 are both 4-digit palindromes but no digit has remained the same between the two. First and fourth, second and third.
No two digit prime number exists that is a multiple of 7. All two digit numbers that are multiples of 7 are compositenumbers.
There are 21 two-digit prime numbers.
679 is the product of the largest single-digit prime number and the largest two-digit prime number.
There are nine two-digit palindromes: 11, 22, 33, 44, 55, 66, 77, 88 and 99.
None. 1221 and 3443 are both 4-digit palindromes but no digit has remained the same between the two. First and fourth, second and third.
No two digit prime number exists that is a multiple of 7. All two digit numbers that are multiples of 7 are compositenumbers.
9797 is the largest two digit prime number.
There are 21 two-digit prime numbers.
679 is the product of the largest single-digit prime number and the largest two-digit prime number.
11 is the smallest two-digit prime number.
The largest two-digit prime number is 97.
The first two-digit prime number is 11.
The two-digit factors of 100 and 1000 are all composite.
There are two possible digits for the first and last digit, and two possible digits for the centre digit, making 2 × 2 = 4 possible 3 digit palindromes from the set {1, 2}, namely the set {111, 121, 212, 222}.
Nine. The sum of the digits must be a multiple of 9; because of the repeated digits, this is only possible if the first two digits add up to 9.