B Nirmala Shastry Solutions for Exercise 3: EXERCISE 4.3

Express the following as sum of twin primes.
$36$
 

Express the following as the sum of three odd primes.

$35$

Express the following as the sum of three odd primes.

$63$

Express the following as the sum of three odd primes.
$21$

What is the sum of the prime numbers coming just before and after $50$?

List the prime numbers between $1$ and $100$ which have their unit digit as $9$.

Numbers $37$ and $73$ are prime numbers. Both these numbers have their digits interchanged. Find such pairs of prime numbers between $1$ and $100$.

Write five pairs of prime numbers less than $25$ whose sum is divisible by $5$.
(e.g., $2+13=15$)