Answer :
Final answer:
The missing number in the sequence 172, 84, 40, _____ is 18. Each number is halved and then decreased by 2 to get the next number in the sequence.
Explanation:
This is a number sequence, a common topic in Mathematics. The pattern here is that each number is multiplied by a certain fraction to get the next number. Starting from 172, we can see that it is multiplied by parts of 1/2 to get the next number, i.e. 172 * 1/2 = 86, but the sequence has 84, so we subtract 2 from the result of multiplication (86 - 2 = 84). We then repeat the process: 84 * 1/2 = 42, subtract 2 to get 40. Following the pattern, we get the missing number: 40 * 1/2 = 20, subtract 2 to give 18. So, the missing number in the sequence is 18.
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