How many rectangles can be formed out of a chess board ?
1740
1230
1296
204
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1
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A number lock on a suitcase has 3 wheels each labeled with 10 digits from 0 to 9. If the opening of the lock is a particular sequence of three digits with no repeats, how many such sequences will be possible?
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2
Discuss

If C(n, 7) = C(n, 5), find n
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3
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From among the 36 students in a class, one leader and one class representative are to be appointed. In how many ways can this be done?
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4
Discuss

How many fourdigit numbers, each divisible by 4 can be formed using the digits 5, 6, 7, 8, 9, repetition of digits being allowed in any number?
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5
Discuss

In a lottery, there are 10 prizes and 25 blanks. A lottery is drawn at random. What is the probability of getting a prize?
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6
Discuss

The number of circles that can be drawn out of 10 points of which 7 are collinear is
Solution 
7
Discuss

How many numbers can be formed from 1, 2, 3, 4, 5 (without repetition), when the digit at the unit’s place must be greater than that in the ten’s place?
Solution 
8
Discuss

In how many ways can a cricketer can score 200 runs with fours and sixes only?
Solution 
9
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A fair coin is tossed 5 times. What is the probability of getting at least three heads on consecutive tosses?
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10
Discuss

If four dice are thrown together, then what is the probability that the sum of the numbers appearing on them is 25 ?
Solution 
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