The recursive formula of the explicit formula
is 
The explicit formula is given as:

When n = 1, we have:


When n = 2, we have:


When n = 3, we have:


So, we have:



Rewrite the functions as follows:



So, we have:



Express 2 as 3 - 1

Substitute n for 3

Hence, the recursive formula is 
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Answer:
E. The online commerce industry isn’t willing to install safeguards on credit card transactions.
Explanation:
With the advent of several online platforms for commercial transactions and with the risk associated withe these transactions, the online commerce industry avails themselves to measures that could curb fraudulent activities. One of such means used in preventing fraud is the use of a high quality payment processor which enables an efficient payment and the verification of the customer's details before transaction.
They also employ the act of storing data so as to avoid requesting too much data from the customers. The use of Secure Sockets Layer, a cryptographic means for digital security is also used by these online sites. Several other measures are employed by businesses to ensure safety during transactions.
Answer: All of the above
Explanation: As the technology is getting improved and advanced time to time, it will put a huge impact on various sections of organization.
The advancement in the IT infrastructures will be seen by the improvement in the software,networks, data centers, hardware etc and their functioning.This will lead increase the focus of the technology towards the IT infrastructure.
Security is the feature that requires to be developed throughout the time as hacker and attackers come up with various attacks and other malicious activity to steal the confidential data and information .Thus security constantly needs to be improved and focused which will continue to happen in 21st century.
Business of organizations are becoming online and this will tend the organizations to become more indulged online business or e-business in future as it provides more benefits and vast coverage .Thus, all the options are correct.
Answer: Business intelligence
Explanation:
Most of the enterprises and organizations collects huge amount of data through the use of MIS. These data can be based on any aspect of the business. But the collection of such large sets of data is useless until and unless there is a business intelligence associated with it. the work of business intelligence is to use software tools for analysis of the collected data so that it could be useful for enterprise or company to look for patterns and trends in the market.
The outcome of such business intelligence is very helpful particularly to managers, executives for taking particular decisions in the greater interest of the company.
So we can say, business intelligence is an approach to boundary spanning that results from using sophisticated software to search through large amounts of internal and external data to spot patterns, trends, and relationships that might be significant.
Answer:
This is an example of Social Engineering security threats
Explanation:
Social Engineering is a process whereby cyber attackers manipulate victims to divulge personal information. These victims are tricked to granting attackers access to valuable and confidential information.
Social Engineering is considered one of the greatest threats to organizations because it is different from hackers trying to break into a system. Social Engineers are granted legitimate access by unsuspecting victims.
Tips to help against Social Engineers.
- Don't be too hasty to respond.
- Be careful of the links you click, research on them before you click them.
- Don't be quick to download files that you are not sure of the source, always check before you download.
- Don't be quick to jump into foreign offers, as they could be the bait to getting your information.