# Permutations and Combinations, Probability

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Let F be be mini 4X4 chessboard => it has 16 fields in all. In how many ways is it possible to select two fields of F such that the midpoint of the segment joining the centres of the two fields should also be the centre of a field?
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Can someone solve this???

@sumitmg  ·  0 karma

a) 1-0.85=0.15

@sumitmg  ·  0 karma

B) 0.85*0.84=0.714

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8 coins tossed. what is the probability that heads does not occur consecutively? Is answer 55/256?

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@Greatavi  ·  196 karma

Yes, it should be 55/256 ..  (1 + 8 + 21 +20 + 5 )/ 2^8

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There are 10  questions, all  of  the  questions  are  True-­‐ False  type  in  nature.         (a)  What  is  the  probability  that  the  student  got  first  five  questions  correct.    b)  What  is  the  probability  that  the  student  got  five  questions  correct.

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@harshit323  ·  379 karma

@sam006 a)1/32 b) 63/256 ??

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Any one with an explanatory solution. ?

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@Greatavi  ·  196 karma

should be 25 i guess .. diagonal of 2 means side should be root(2) .. that means distance between opposite sides should be root(2) .. this means the intercept of the parallel lines should have a difference of 2 ..

that gives us 5*5 = 25 combinations ..

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The number of five-digit telephone numbers having at least one of their digits repeated is a) 90000 b) 100000 c) 30240 d) 69760

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@anshulbansal850  ·  2 karma

69760

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find the number of whole number solution for

a+b+c+d=24

and a<=b<=c<=d

@anshulbansal850  ·  2 karma

@sachinjha yeh nahi ho sakta yeh hota hai jb  a<=b<=c<=d  yeh wali condition ni hoti

@KrunalM21  ·  30 karma

#

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38 n 39 ? OA 38 : 9400 39 : 95277000

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can someone explain the method for distinct balls being distributed to identical boxes? i have no clue about bens number and sterling concept 🙈

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xyz=10^6 . what are no of natural integral solutions?