The equation x^2 + ax + b = 0 is such that when one of its roots in increased by 2 the constant term increases by 10 & when the other root is increased by 3 the constant term reduces by 12, (a, b) is?
All a are b.
So can we conclude: All a can never be b.?
in how many ways can four persons be seated out of 5 boys and 3 girls on four different seats? is this a problem of grouping n dissimilar things and then dividing them ? Please share approach.
there are three states and three students representing each state.in how many ways can 5 students be chosen such that at least one student is chosen from each state.
Is there anything available online for PnC concepts or is practicing problems the way to go?
A diamond expert cuts a huge cubical diamond into 960 pcs. in minimum no. of 'n' cuts.If he wants to maximize the no. of identical diamond pcs. making same no. of 'n' cuts to it.So the maximum no. of such diamond pcs. are- a)1000 b)1331 c)1200 d)N.O.T....Plz explain in detail
A number is like aabbc, where a>b>c eg 88331. If
how to approach?
k(N) denotes the number of ways in which N can be expressed as a difference of two prefect squares. Which of the following is max?
a) k(110) b) k(105) c) k(216) d k(384)
Could someone help with the approach please, not convinced with the solution in the book
In a test there are total n questions. B answers 20 out of 25 questns correctly in the 1st section.In the second test he answers 60% questns correctly and thus is total score is 66.66% in the test. Given that all questns carry equal marks,without any -ve marking.The total no of questions in the test is-
A)50
b)60
C)75
D)100
Please share the approach as well !
Hey guys, can u pls suggest a good place from where I can practice di and lr. Thanks 😃