Advertisements
Advertisements
Question
Choose the correct alternative:
The number of rectangles that a chessboard has ______
Options
81
99
1296
6561
Solution
1296
APPEARS IN
RELATED QUESTIONS
If nPr = 1680 and nCr = 70, find n and r.
How many chords can be drawn through 21 points on a circle?
How many triangles can be formed by joining the vertices of a hexagon?
Out of 7 consonants and 4 vowels, how many words of 3 consonants and 2 vowels can be formed?
If four dice are rolled, find the number of possible outcomes in which atleast one die shows 2.
A committee of 5 is to be formed out of 6 gents and 4 ladies. In how many ways this can be done when
- atleast two ladies are included.
- atmost two ladies are included.
In how many different ways, 2 Mathematics, 2 Economics and 2 History books can be selected from 9 Mathematics, 8 Economics and 7 History books?
If nC3 = nC2 then the value of nC4 is:
If `""^(("n" + 1))"C"_8 : ""^(("n" - 3))"P"_4` = 57 : 16, find the value of n
There are 15 persons in a party and if each 2 of them shakes hands with each other, how many handshakes happen in the party?
How many chords can be drawn through 20 points on a circle?
In a parking lot one hundred, one-year-old cars, are parked. Out of them five are to be chosen at random for to check its pollution devices. How many different set of five cars can be chosen?
There are 5 teachers and 20 students. Out of them a committee of 2 teachers and 3 students is to be formed. Find the number of ways in which this can be done. Further find in how many of these committees a particular student is excluded?
In an examination a student has to answer 5 questions, out of 9 questions in which 2 are compulsory. In how many ways a student can answer the questions?
Determine the number of 5 card combinations out of a deck of 52 cards if there is exactly three aces in each combination
Find the number of ways of forming a committee of 5 members out of 7 Indians and 5 Americans, so that always Indians will be the majority in the committee
How many triangles can be formed by 15 points, in which 7 of them lie on one line and the remaining 8 on another parallel line?
Choose the correct alternative:
`""^(("n" - 1))"C"_"r" + ""^(("n" - 1))"C"_(("r" - 1))` is
Choose the correct alternative:
The product of first n odd natural numbers equals
