Please Help! Medal Will be given
Three numbers are drawn from {1, 2, 3, 4, 5, 6, 7} and placed in a row in the order drawn to form a three-digit number.
(b) The first digit is 2, 4, or 7.
(c) It is larger than 500.
(d) It is less than 427.

Question

Please Help! Medal Will be given
Three numbers are drawn from {1, 2, 3, 4, 5, 6, 7} and placed in a row in the order drawn to form a three-digit number. 
(b) The first digit is 2, 4, or 7.
(c) It is larger than 500.
(d) It is less than 427.

anonymous · Answer

Can someone help me start the problem?

anonymous · Answer

Please help

anonymous · Answer

@douglaswinslowcooper can you help me?

anonymous · Answer

Are c) and d) separate problems? Cannot both be larger than 500 and less than 427.
What was a)?

anonymous · Answer

I was able to get part c by multiplying 3*6*5=90 and then dividing 90/210. Yes they are separate problems an A was 210 I multiplied 7*6*5=210

anonymous · Answer

(a) The number is 456. this was the question

anonymous · Answer

I am missing the point. Are the three numbers supposed to be multiplied or just treated like any three-digit number?

anonymous · Answer

Yes there are three numbers that are suppose to be multiplied

anonymous · Answer

For d, you know that the three numbers when multiplied must be >99 and <1000 to give another three-digit number. 1 is ruled out as first digit, so is 2 as 267 too small=84, but 3 will work with two larger numbers. so will 4 and 5. It is this kind of process of elimination that seems needed.