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To solve the problem of calculating 3 multiplied by 7 squared, you need to first understand the order of operations. In this case, you should calculate the exponent before performing the multiplication.

First, calculate 7 squared, which means 7 multiplied by itself:

7 × 7 = 49.

Next, take this result and multiply it by 3:

3 × 49 = 147.

This leads to the correct answer being 147. Recognizing that squaring a number involves multiplying it by itself is key to arriving at the correct result. Thus, the option that states 147 is indeed the valid answer.