JediKnightRevan JediKnightRevan 17-12-2022 Mathematics Answered Diagram 6 shows a six-number card. 3 5 6 7 8 9 4-digit codes are to be formed using only 4 of the cards. How many of different codes can be formed if, a) the code is an odd number more than 6600. b) the code is an odd number more than 7000.