Question

which is a double of the difference between the sun of the prime numbers from 31 to 40 and 61 to 70​

Answer 1

Answer:

The prime numbers between 70 and 90 are 71, 73, 79, 83 and 89. (iii) The prime numbers between 40 and 85 are 41, 43, 47, 53, 59, 61, 67, 71, 73, 79 and 83 ... (ii) Here, the number formed by the last two digits is 31 which is not divisible by 4 ... Rule: A number is divisible by 11 if the difference of the sums of the alternate ...