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Mathematics: Post your doubts here!

syed1995

syed1995

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prekshya said:
w-06-qp-6 no. 6 ii help plzz..
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Always link the papers.. people will be able to help you faster...

whenever it asks for not together .. always do Total - Together

Total = 9! = 362880

Two Women Together ..

W W _ _ _ _ _ _
2 women to be chosen out of 3 .. 7 places where these 2 women as a block can be placed .. 6 men + 1 women can go anywhere in the remaining 7 places ..
3P2 * 7 * 7! = 211680

2 Women Not Together = Total - Together
= 9! - 211680
= 151200 Answer
 
prekshya

prekshya

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tha
PhyZac said:
6 men 3 women
no women beside each other
thus
_M_M_M_M_M_M_
u see, i made blanks between men, and women can choose any of these blanks.
therefore
6! x 7P3 ( 6! because u rearrange the 6 men) (7P3, because out of these 7 blanks, 3 are permutated depeneding on where will 3 women stay)
answer = 151200
Click to expand...
thanks :))
 
salvatore

salvatore

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syed1995 said:
finally a stats question...

Total Girls 7
Total Boys 6

2 Boys and 2 girls need to be chosen .. while 2 girls are as such that either they are both in the team or not in the team.

Boys And Twins in Team ( Since there are just 2 team members to be chosen and both will be those 2 twins)
6C2 * 2C2

Boys and Twins Not in Team ( Since there are 7 total girls ... total - 2 twins = 5 girls in total left to choose from)
6C2 * 5C2

Total ways = 165 Ways
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PhyZac said:
see what syed1995 wrote.
And I will tell my reply to ur question.

we need 2 girls...and the are 5 normal girls and 2 twin sisters.
If we are to choose the 2 twin sisters. then the girls are confirmed, like there are no more to choose.

If we dont take the twin..we have 5 left...and we take 2 thus 5C2
Hope u get it.
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I got it now.. thanks a lot guys :)
 
GorgeousEyes

GorgeousEyes

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falcon678 said:
eeeps it waz (300-100)/5 +1
well ummm it said the terms between 300 n 100...thus there r 2oo terms b/t found by subtracting them...n since there is a gap of 5...v divide them by 5....it also said inclusive of 100 n 300...since 300 comes withn tht 200....v ve to add 1 for 100....

i hope u got it...m not much of explainer.... :cautious:
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syed1995 said:
To find number of terms you can do use this formulae. d = (l-a)/(n-1)

You need to keep in mind words like inclusive and non inclusive..

Where d is difference l is last term a is first term and n is total number of terms..

so 5 = (300-100)/n-1
n-1 = 200/5
n-1 = 40
n = 41
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Thank you both :)
 
syed1995

syed1995

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PhyZac said:
6 men 3 women
no women beside each other
thus
_M_M_M_M_M_M_
u see, i made blanks between men, and women can choose any of these blanks.
therefore
6! x 7P3 ( 6! because u rearrange the 6 men) (7P3, because out of these 7 blanks, 3 are permutated depeneding on where will 3 women stay)
answer = 151200
Click to expand...

Your method seems easier! Thanks for this .. I will be using this from now on :)
 
syed1995

syed1995

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prekshya said:
s-07-qp-6 no.5ii. help plz..
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REFRIGERATOR
Total = 12
R =4
E = 2

4 letters to be chosen.. No Rs 2 Es 12-4 = 8

New Data = EEAFIGTO Total = 8

2 E are chosen for sure.. so remaining 6 letters.. AFIGTO

E E _ _

Two letters to be chosen from the remaining 6

= 6C2 * 2C2
= 15 Ways
 
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