Out of the three options: 121, 309, and 6767, 121 is the number that creates a palindrome. It can be read the same forwards and backwards.
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121
121
11 is a palindrome.11 squared (i.e., 11 times 11) is 121, which is also a palindrome.
Read it backwards.
11 is a palindrome. 11 squared (i.e., 11 times 11) is 121, which is also a palindrome.