Here this will help.
http://www.meritnation.com/ask-answer/question/the-sum-of-the-first-n-terms-of-an-ap-whose-first-ter...
Answer: x=7
Step-by-step explanation:
Answer:
144 ways
Step-by-step explanation:
Let's think of the 3 persons sitting together as "one". So essentially we have 3 + "1" = "4" persons to arrange.
THey can be arranged in 4! ways, which is:
4! = 4 * 3 * 2 * 1 = 24 ways
Now, the 3 persons themselves can be arranged in 3! ways, which is:
3! = 3 * 2 * 1 = 6 ways
Total ways = 4! * 3! = 24 * 6 = 144 ways
Answer:
the product of 2(3/4) is the same as (3/2) and then the product of 1(3/5) remains the same
therefore, (3/2)×(3/5) = (9/10)
<h2>thanks</h2>