how many 3 digit numbers are formed with all digits that starts with the odd number and ends with even when repetition is allowed?

• 20 is answer
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• 200
  1_2_3 to fill 1 and 3 there r 5 ,5 option so 5*8*5
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• 3 digit numbers are from 100 to 999
  from 100 to 109 there are 5 (100,102,104,106,108)
  similarly between 100 to 199 there are 50
  1,3,5,7,9 are odd numbers _**
  so 5*50=250
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