I just able to answer 1 of 2 question. please find attached file regarding my calculation regarding the second part of the question. the correct ans from the book is 30.
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Originally Posted by nikconsult I just able to answer 1 of 2 question. please find attached file regarding my calculation regarding the second part of the question. the correct ans from the book is 30. Those numbers must begin with either a 3 or 4 and end with an odd digit. So you must consider two cases: 1) numbers that begin with a 3 and end with 5 or 7. 2) numbers that begin with a 4 and end with 3, 5 or 7. Add those together.
thank you mr ploto.. i try to solve it. why should we separate it into 2 case here & add??
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