Sum of n terms in a geometric progression is given by Sn = a1 (1 - r^n) / (1 -r)
3( 1 - 4^6) / (1-4)
= 4,095
D the mathematical work shown sbove is correct as written
The rule is to put them in order
Answer:
Option b) 
Step-by-step explanation:
We are given the following information in the question:
Total number of marbles = 65
Number of green marbles = 17
We have to find the probability of drawing 2 green marbles at random without replacement.
Formula:




Option b) 
Answer:
Step 3 contains error.
Step-by-step explanation:
The given equation is :

Step 1.
Cross multiplying,

Step 2.
Subtract 9 from both sides

Step 3.
Cross multiplying

So, there is an error in step 3. The correct answer should be 45.