Question

$\bold{\textsf{What is the value of:}}\\\\\displaystyle\underbrace{\sum_{1\leq i\ \textless \ j\leq 10 }}_{\text{i+j=odd}} (i+j) - \underbrace{\sum_{1\leq i\ \textless \ j\leq 10 }}_{\text{i+j=even}} (i+j)$

Answer 1

here is your answer

hope u understand it

Answer 2

Step-by-step explanation:

refer to the attachment':