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**Jai Ganesh****Administrator**- Registered: 2005-06-28
- Posts: 43,477

To find the probability of event A or B, we must first determine whether the events are mutually exclusive or non-mutually exclusive. Then we can apply the appropriate Addition Rule:

Addition Rule 1: When two events, A and B, are mutually exclusive, the probability that A or B will occur is the sum of the probability of each event.

P(A or B) = P(A) + P(B)

Addition Rule 2: When two events, A and B, are non-mutually exclusive, there is some overlap between these events. The probability that A or B will occur is the sum of the probability of each event, minus the probability of the overlap.

P(A or B) = P(A) + P(B) - P(A and B).

Your solution is correct. Good work!

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**666 bro****Member**- From: Flatland
- Registered: 2019-04-26
- Posts: 706

The solution of #304 is r=5.

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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**Jai Ganesh****Administrator**- Registered: 2005-06-28
- Posts: 43,477

Hi,

Neat work!

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**666 bro****Member**- From: Flatland
- Registered: 2019-04-26
- Posts: 706

The solution of #259 is n=35

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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**Jai Ganesh****Administrator**- Registered: 2005-06-28
- Posts: 43,477

Hi,

Excellent!

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**666 bro****Member**- From: Flatland
- Registered: 2019-04-26
- Posts: 706

Solution to #311 is (1/3).

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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**Jai Ganesh****Administrator**- Registered: 2005-06-28
- Posts: 43,477

Hi,

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**666 bro****Member**- From: Flatland
- Registered: 2019-04-26
- Posts: 706

Solution for#254 is [(2) / (x-2)(x-4)]

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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**666 bro****Member**- From: Flatland
- Registered: 2019-04-26
- Posts: 706

The solution for #262 is -(a+nd).

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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**666 bro****Member**- From: Flatland
- Registered: 2019-04-26
- Posts: 706

Solution of #331: The values are

a=-13

b= 8

*Last edited by 666 bro (2020-06-10 04:48:45)*

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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**666 bro****Member**- From: Flatland
- Registered: 2019-04-26
- Posts: 706

The solution for #277 is 6

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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**Jai Ganesh****Administrator**- Registered: 2005-06-28
- Posts: 43,477

I am unable to check *** problems for some time

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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