How many parallelograms will be formed if 7 parallel horizontal lines intersect 6 parallel vertical lines?
42
294
315
258
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1
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A coin is tossed 5 times. What is the probability that head appears an odd number of times?
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2
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If
SolutionAnswer :1/2 |
3
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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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4
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It is required to seat 5 boys and 4 girls in a row so that the girls occupy the even places. How many such arrangements are possible?
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5
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There are 20 people among whom two are sisters. Find the number of ways in which we can arrange them around a circle so that there is exactly one person between the two sisters.
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6
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In how many different ways can the letters of the word 'MATHEMATICS' be arranged so that the vowels always come together
Solution |
7
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How many rectangles can be formed out of a chess board ?
Solution |
8
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A box contains 5 green, 4 yellow and 3 white marbles. three marbles are drawn at random. What is the probability that all they are not of the same colour?
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9
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How many 3-digit numbers can be formed from the digits 2, 3, 5, 6, 7 and 9, which are divisible by 5 and none of the digits is repeated
Solution |
10
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Three chairs are arranged in a row facing three other chairs. 4 boys and 2 girls are to be seated on these chairs such that girls are always facing each other. In how many ways can they be seated?
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