MEDIUM
CUSAT CAT
IMPORTANT
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From 6 different novels and 3 different dictionaries, 4 novels and 1 dictionary are to be selected and arranged in a row on the shelf so that the dictionary is always in the middle. Then the number of such arrangement is

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Important Questions on Permutation and Combination

MEDIUM
CUSAT CAT
IMPORTANT
The largest non-negative integer k such that 24k divides 13! is
HARD
CUSAT CAT
IMPORTANT
How many odd numbers of six significant digits can be formed with the digits 0, 1, 2, 5, 6, 7 when no digit is repeated?
MEDIUM
CUSAT CAT
IMPORTANT
The number of distinct primes dividing 12!+13!+14! Is
HARD
CUSAT CAT
IMPORTANT
The number of sides of a polygon with 44 diagonals is
MEDIUM
CUSAT CAT
IMPORTANT
n-similar balls each of weight w when weighed in pairs the sum of the weights of all possible pairs is 120 when they are weighed in triplets the sum of the weights comes out to be 480 for all possible triplets, then n is
MEDIUM
CUSAT CAT
IMPORTANT
From 6 different novels and 3 different dictionaries, 4 novels and 1 dictionary are to be selected and arranged in a row on the shelf so that the dictionary is always in the middle. Then the number of such arrangement is