1 + 9 + 24 + 46 + ... Find the sum of sequence
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LAThe difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?
frank
Find the number of numbers that can formed using all the digits 1, 2, 3, 4, 3, 2, 1 only once so that the odd digits occupy the odd places only?
A.
4!/(2!)2
B.
7!/(2!)3
C.
1! 3! 5! 7!
D.
None of these
Three positive consecutive integers are raised to the first, second and third power respectively and then added. The sum so obtained is perfect square whose square root is equal to the total of the three original integers. Which of the following best describes the minimum, say m, of these three integers?
A. 1≤m≤3
B.4≤m≤6
C.7≤m≤9
D.10≤m≤12
E.3≤m≤15
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