Answer: 
Step-by-step explanation:
Since we have given that

Now, we know the rule for summation , we'll apply this ,

Now, it becomes geometric progression, so we us the formula for sum of terms in g.p. which is given by

So, our equation becomes ,

Hence ,

Infinitely many solutions is the answer : D
48 marks. Because 80/10 is 8. 8x6 =48
Answer:
12.5%
Step-by-step explanation:
percent = # of October birthdays/total class # = 4/ 32 = 1/8 = 0.125 = 12.5%