TCS Company Numerical Ability Permutation and Combination

in how many 15 people be seated around two round tables with seating capacities of 7 and 8 people

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TCS Other Question

how many words can be formed by re arranging the letters of the word 'problems' such that p and s occupy the first and last positions respectively? how many 3 digit numbers are possible using the digits 0,1,4,5,7 and 9?