Question

The sum of prime numbers that are greater than 60, but less than 70 is :

• A. 128
• B. 191
• C. 197
• D. 260

Answer 1

The Correct Option is A

To find the sum of prime numbers that are greater than 60 but less than 70, we first identify the prime numbers within this range. A prime number is a number that has no divisors other than 1 and itself. The numbers to consider between 60 and 70 are:

• 61
• 62
• 63
• 64
• 65
• 66
• 67
• 68
• 69

We check each number for primality:

• 61: Divisible only by 1 and 61 (Prime)
• 62: Divisible by 2 (Not Prime)
• 63: Divisible by 3 (Not Prime)
• 64: Divisible by 2 (Not Prime)
• 65: Divisible by 5 (Not Prime)
• 66: Divisible by 2 (Not Prime)
• 67: Divisible only by 1 and 67 (Prime)
• 68: Divisible by 2 (Not Prime)
• 69: Divisible by 3 (Not Prime)

The prime numbers are 61 and 67. We now calculate their sum:

Sum = 61 + 67 = 128

Therefore, the sum of the prime numbers that are greater than 60 but less than 70 is 128.