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JEE Mains · Maths · STD 11 - 6. permutation and combination

सात अंकीय संख्याओं की संख्या, जो \(11\) का गुणज हो तथा \(1,2,3,4,5,7\) तथा \(9\) से बनाई गई हो, होगी

  1. A \(457\)
  2. B \(635\)
  3. C \(576\)
  4. D \(485\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(576\)

Step-by-step Solution

Detailed explanation

Digits are \(1,2,3,4,5,7,9\) Multiple of \(11 \rightarrow\) Difference of sum at even and odd place is divisible by \(11\) . Let number of the form abcdefg \(\therefore( a + c + e + g )-( b + d + f )=11 x\) \(a + b + c + d + e + f =31\)…
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