A test consists of 12 questions out of which candidates a...
A test consists of 12 questions out of which candidates are to answer 10. If the first 6 are compulsory, in how many ways can each candidate select her questions?
40
25
15
10
Correct answer is C
The first 6 questions can only be selected in 1 way.
The remaining 4 questions can be selected in 6C4 ways.
= 6!(6−4)!4!=15
The fourth term of a geometric sequence is 2 and the sixth term is 8. Find the common ratio. ...
Find the area of the circle whose equation is given as x2+y2−4x+8y+11=0...
Find the minimum value of y=x2+6x−12....
If 2log42=x+1, find the value of x....
The equation of a curve is given by y=2x2−5x+k. If the curve has two intercepts on the ...
Two functions f and g are defined by f:x→3x−1 and g:x→2x3, evaluate \(fg(-2...
P, Q, R, S are points in a plane such that PQ = 8i - 5j, QR = 5i + 7j, RS = 7i + 3j and PS = x...