Latest Elitmus Aptitude Question SOLUTION: How many 6 digits number can be formed using the digits 1 to 6,without repetition such that the number is divisible by the digit at its unit place? (A)402 (b)528 (c)648 (d)720

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(#M40052570) ELITMUS Category question Permutation and combination Keep an EYE

How many 6 digits number can be formed using the digits 1 to 6,without repetition such that the number is divisible by the digit at its unit place?

(A)402
(b)528
(c)648
(d)720

Asked In Elitmus mona rani (9 years ago)

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adityesh mohanty  (9 years ago)

the numbers will end with 1,2,3,4,5,6
the numbers made with last digit as 1 is
5*4*3*2*1=120
similarly for 6 digits is
120*6=720
but in case of 4 the number is not divisible when it is 14,34,54
those combinations are 4*3*2*1=24*3=72(bcoz 14,34,54 (3) combinations)
720-72=648

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