Yes
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It is 39.
2, 26, 39
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.
Not all of them because 39 is an odd number that is not a prime number because it has more than two factors whereas prime numbers have only two factors.
No because as for example 39 is an odd number but it is also a composite number because it has more than two factors and prime numbers have only two factors.