if all the words of the letter SMART are written in a dictionary . then find the rank of the word smart .

1) 64
2) 49
3) 79
4) 78

• We can arrange the word SMART as per as the alphabetical order is A,M,R,S,T
  
  now for s,
  3 letter before s. so, s-->3*4!=72
  now for M,
  1 letter before M. so, M-->1*3!=6
  now for A,
  no letter before A. so, A-->0*2!=0
  now for R,
  no letter before R. so, R-->0*1!=0
  
  at last for T is 1.
  
  therefore 72+6+1=79
  
  so,ans is option (3) 79.
  
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