MATHS
posted by BRYAN .
Each Sunday the hymns to be sung are displayed on a hymnboard using numbered cards. The cards have the digits 0 to 9 on them. The hymn book has 750 hymns in it. Three different hymns are sung each service.
a) What is the smallest number of cards the church must have to be able to display any combination of 3 hymns?
b) If the number 6 can be used as an upsidedown 9, how many cards can be saved from your anwswers to (a)?

the first card: 17
the second card: 09
the third card: 09
I calculate so that is lets see, 28 cards?
YOu can save three two cards, the second set of 9's. 
Sorry, I'm still don't understand the suppose answer is a) 66 b) 4
Respond to this Question
Similar Questions

Math
I am not sure how to go about figuring this out ... Shuffle the numbered cards of an ordinary deck of cards (aces equal 1). Pick out one card to be the answer card. Then deal off the top four cards to use for an equation. Try to use … 
statistics
The red face cards and the black cards numbered 29 are put into a bag. Four cards are drawn at random without replacement. Find the following probabilities: a) All 4 cards are red b) 2 cards are red and two cards are black c) At least … 
Maths
Three boys shared some cards. Peter had twice as many cards as Farid. The ratio of the number of cards Peter had to the number of cards Kiran had was 6:5. Farid gave 2/3 of his cards to Peter and the rest to Kiran. How many cards did … 
Maths
Five red cards numbered 1,2,3,4,5 and two black cards both numbered 5 are randomly ordered facedown into a pile. The cards are flipped over one at a time until either the sum of the numbers on the red cards is at least 10, or the … 
Math
Five red cards numbered 1,2,3,4,5 and two black cards both numbered 5 are randomly ordered facedown into a pile. The cards are flipped over one at a time until either the sum of the numbers on the red cards is at least 10, or the … 
Math
" kelly has twelve cards numbered 1 to 12. what is the probability of picking three evennumbered cards consecutively, if the first two cards are not replaced? 
MATHS
Each Sunday the hymns to be sung are displayed on a hymnboard using numbered cards. The cards have the digits 0 to 9 on them. The hymn book has 750 hymns in it. Three different hymns are sung each service. a) What is the smallest … 
algebra
Tarot cards are used for telling fortunes, and in a reading, the arrangement of the cards is as important as the cards themselves. How many different readings are possible if three cards are selected from a set of seven Tarot cards? 
Grammar
The national anthem sung/was sung/had sung/ was sung at the Super Bowl by Whitney Houston. What is the right tense in this sentence please. 
probability
Tad draws three cards at random, without replacement, from a deck of ten cards numbered 1 through 10. What is the probability that no two of the cards drawn have numbers that differ by 1?