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Find whether 55 is a term of the A.P. 7,...

Find whether 55 is a term of the A.P. 7, 10, 13, … or not. If yes, find which term is it.

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CENGAGE PUBLICATION-PERMUTATIONS AND COMBINATIONS-All Questions
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  2. Find the remainder when 1!+2!+3!+4!+.......+n ! is divided by 15, if n...

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  3. Find whether 55 is a term of the A.P. 7, 10, 13, … or not. If yes, fin...

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  4. Find the total number of two-digit numbers (having different digits), ...

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  5. Find the A.P. whose nth term is 7 – 3K. Also find the 20th term.

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  11. Find the number of non negative integral solutions of x1 + x2 + x3 + 4...

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  12. If the common difference of an A.P. is – 3 and the 18th term is – 5, t...

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  13. In how many different ways can 3 persons A, B, C having 6 one-rupee ...

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  14. If 6x + 5y – 7 = 0 and 2px + 5y + 1 = 0 are parallel lines, find the v...

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  15. In how many ways 3 boys and 15 girls can sits together in a row such ...

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  16. If the lines y = 3x + 7 and 2y + px = 3 perpendicular to each other, f...

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  17. If the 11 letters A, B, ..., K denote an arbitrary permutation of he ...

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  18. In how many ways can four people, each throwing a dice once, make a su...

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  19. If the straight lines kx – 5y + 4 = 0 and 4x – 2y + 5 = 0 are perpendi...

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