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A 10 digit positive number is said to be a“LearnHub”number if its digits are alldistinct and it is a multiple of 11111. Howmany “LearnHub” numbers are there?

Read Solution (Total 3)

10 digit number and all digits distinct
Sum of digits = 45
Number is divisible by 9

Number is divisible by 99999
If number is of form abcdefghij, then

abcde + fghij = 99999
a + f = b + g = c + h = d + i = e + j = 9
We have 5 such pairs (0, 9), (1, 8 ), (2, 7), (3, 6), (4, 5)

So, we can choose abcde in 9*8*6*4*2 = 3456 ways as leading zero is not permitted.
a can have value from 1 to 9 and corresponding value of f is also fixed.
b can have value from balance 8 values ( leaving values fixed for a and f from 0 to 9) and corresponding value of g is also fixed.
..
..
Once abcde is chosen, fghij is automatically chosen

So, 3456 such numbers
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plz type the question properly
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type ques crctly..
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and there some questions based on reasoning where 4 people choose numbers here the answer is the ""person saying i dont have the highest number generally a name comes called easha"" and a pairing question where h and l is a pair and g and m is a pair so u have 4 choices by this rule u can rule out three option and the remainng one left is something starts with G.... as rest three option starts with F.... so G.... is the answer Find the number of ordered triplets (a, b, c)
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2000.
60
40
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70