Question : Find the average of the prime numbers lying between 51 and 77.
Option 1: 65
Option 2: 64
Option 3: 67
Option 4: 66
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Correct Answer: 64
Solution : Prime numbers between 51 and 77 are 53, 59, 61, 67, 71, and 73. $\therefore$ Average = $\frac{53+59+61+67+71+73}{6}$ = 64 Hence, the correct answer is 64.
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