They are 73 79 and 83
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The three prime numbers between 70 and 80 are: 71, 73, 79
71 is, itself, a prime number.
Prime numbers between 71 to 80 = 73 and 79 Therefore there are 2 prime numbers between 71 to 80.
2 + 71 + 79 = 152
The numbers 71, 73 and 79 are prime.