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The 78th odd number can be calculated using the formula 2n-1, where n represents the position of the odd number in the sequence. Therefore, for the 78th odd number, n would be 39 since odd numbers occur at every other position. Plugging 39 into the formula, we get 2(39)-1 = 77. Hence, the 78th odd number is 77.
For any number n you could use * (n % 2 == 0), which would be true for an even number, false for odd For an integer i, a simpler method would be * (i & 1), which would be true for an odd number, false for even
29
2n + 1 where n is an integer.
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