Answer:the first one
Step-by-step explanation:

Factorise both the term by splitting the mid term and you'll get
Answer:4
Step-by-step explanation:
Let a denotes the no of odd ball selected and b denotes the no of even ball selected
then 
for 
for 
for 
for 
thus X can take 4 values i.e. 9,10,11 and 12




<span>What is the value of each of these digits in 654 321?
</span>21