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Question: Choose the prime factorization of 242.


A ) 11 × 11
B ) 2 × 2 × 11
C ) 2 × 11
D ) 2 × 11 × 11

Steps to derive

1 The factor tree of 242 is:
 [242 = 2 × 121, 121 = 11 × 11.]


2 The circled numbers in the factor tree are the prime factors of 242.

3 242 = 2 × 11 × 11

4 So, the prime factorization of 242 is 2 × 11 × 11.



Hence the right answer is Option D

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