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Find the number of three-digit numbers f...

Find the number of three-digit numbers from 100 to 999 including all numbers which have any one digit that is the average of the other two.

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CENGAGE ENGLISH-PERMUTATIONS AND COMBINATIONS-All Questions
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  6. The number of arrangements of the letters of the word BANANA in whic...

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  8. A three-digit number is to be formed using the digits 0, 1, 2, 3, 4, a...

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  9. If N is the number of ways in which 3 distinct numbers canbe select...

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  10. Find the total number of nine-digit numbers that can be formed using t...

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  11. m men and n women are to be seated in a row so that no two ...

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  12. 10 different letters of an alphabet are given. Words with 5 letters ar...

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  13. If ^n Cr=84 ,and ^n C(r-1)=36 , and r = 1 , then find the value of ndo...

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  14. Eight chairs are numbered 1 to 8. Two women and three men wish to oc...

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  15. The value of expression .^47 C4+sum(j=1)^5.^(52-j)C3 is equal to a.....

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  16. The number of n digit numbers which consists of the digit 1 and 2 on...

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  17. If ^n C3+^n C4>^(n+1)C3 , then a. n >6 b. n >7 c. n<6 ...

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  18. The value of sum(r=0)^(n-1)^n Cr//(^n Cr+^n C(r+1)) equals a. n+1 ...

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  19. A bag contains four one-rupee coins, two twenty-five paisa coins, a...

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