How many keys are required, if you are to ensure a secret communication for every possible pair of communicating parties

7140 pairs of key

Explanation:

In calculating the number of pairs of keys required, the formula to be used is

n * (n−1) / 2

So for example, if we're to consider 120 users. This means our n is 120, and thus applying it in the formula would yield the calculation

120 * (120-1) / 2 =

120 * 119 / 2 =

14280 / 2 =

7140 key pairs.

Therefore, we boldly state that be number of pairs of key required is 7140

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some have built technology like spoofed call blockers into their networks, so there's nothing you would even have to install.

this happens because the number is known for scamming, they don't want it to me known as "scam likely." perhaps it's just a telemarketer. maybe it's an identity thief. it might even be a scam artist.  

either way, "scam likely" is probably not an old friend whose number you forgot that you saved. it's your wireless carrier's way of letting you know: answer at your own risk.

explanation:

to combat the seemingly rising epidemic of spam callers in the u.s., the nation's four major wireless carriers have been trying out new methods to reduce the number of unsolicited calls americans receive each day.

some have built technology like spoofed call blockers into their networks, so there's nothing you would even have to install.

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