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Numerical Ability
Permutation and Combination
A teacher set a ques ppr consist of 8 question of total 40 marks such that each question contains minimum two marks and integer number of marks. In how may ways this can be done?
a)48C7 b)31C7 c)32C7 d)40C8
Read Solution (Total 4)
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- 2no is sure to divide b/w 8 ques so no which we need to divide is only=40-(8×2)=24
and by the therom if we want to divide n different thing in r part then formula is=n+r-1Cr-1
So ans is =24+8-1C8-1=31C7 - 9 years agoHelpfull: Yes(26) No(0)
- (x1+2)+(x2+2)+(x3+2).............(x8+2)=40
hence x1+x2+x3+.........x8=24....
Apply non negative integer formula 24+8-1C8-1= 31C7 - 9 years agoHelpfull: Yes(11) No(0)
- d)40 C8 fdhsjkLszvhjdiasLSk
- 9 years agoHelpfull: Yes(1) No(27)
- Since there is a condition that each question should get at least 2 marks so first we are giving 2 marks to each of 8 questions.After giving 2 marks to each of 8 questions we have remaining (40-(8*2))=24 marks.Again this 24 marks we have to distribute to 8 questions.This can be done by the rule n+r-1Cr-1.Here n is 24 and r is 8.So the ans is
24+8-1C8-1=31C7 - 8 years agoHelpfull: Yes(0) No(0)
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