Please explain how you got the answer.
1. Find the number of integers between 500 and 700 in which the sum of the digits is 12.
2. The integers greater than 1 are arranged, 4 in each row, in 5 colomns as follows: (The X's are blanks)
2, 3, 4, 5 X
X 9, 8, 7
10,11,12,13 X
X 17,16,15,14
If the pattern is followed, in which column will the number 1001 occur?
3. The positive intergers are arranged in the pattern indicated in the diagram. What number will be found in the square for the 61st (horizontal) row and 23rd (vertical) column?
1
2,3
4,5,6
7,8,9,10
11,12,13,14,15
16,17,18,19,20,21
...
2007-01-17
09:49:39
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1 answers
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asked by
Amy
2
in
Mathematics