99 + 98 + 97 = 294
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To solve this expression, you need to follow the order of operations, which is parentheses, exponents, multiplication and division (from left to right), and addition and subtraction (from left to right). In this case, you would first add 99 and 98 to get 197. Then subtract 97 from 197 to get 100. Continue this pattern of adding and subtracting the numbers in sequence to get the final result, which is 100.
97 is a prime number. 98 and 99 are not.