60. How many 7-digit palindromes (numbers that read the same backward as forward) can be formedusing the digits 2,2,3,3,5,5,5?()(A)6(B)12(C)24(D)36 相关知识点: 试题来源: 解析 60.A解:七位的回文数应是形如abcdcba,很显然d=5。剩下的问题就是abcdcba的前三位abc有几种可能性?
How many 3-digit positive integers are there whose middle digit is equal to the sum of the first and last digits? How many positive three-digit numbers can be made from the digits 4, 5, 6, and 7 if no digit can be used more than once in a given number?
How many ternary {eq}(0, \ 1, \ 2) {/eq} sequences of length {eq}10 {/eq} are there without any consecutive digits the same? Sequence The sequence is the set of data which is arranged in order, and there is various type of sequence available fo...
3 4 int main() 5 { 6 char intEquivalent; /* letter, digit or character */ 7 8 printf( "Input a letter, digit, or character: " ); /* prompt */ 9 scanf( "%c", &intEquivalent ); /* read user input */ 10 11 printf( "%c's integer equivalent is %d\n", intEquivalent, 12...
There are some special effects that this parameterization allows, but it goes beyond the scope of this article. Experiment with changing the parameter you pass to next() and see what happens!Remove ads Example 3: Detecting Palindromes You can use infinite sequences in many ways, but one ...
function splitByMany( manyArgs, string ) { do { let arg = manyArgs.pop() string = string.replace(arg, manyArgs[0]) } while (manyArgs.length > 2) return string.split(manyArgs[0]) } So, in your case, you could then call let array = splitByMany([" ", ","], 'My long str...
Palindromes: A palindrome is a word or phrase that reads the same forwards and backwards. The cryptic part of the clue will generally just clue you in that it is a palindrome. (In the explanation, this will be marked with > and < symbols.) ...
function splitByMany( manyArgs, string ) { do { let arg = manyArgs.pop() string = string.replace(arg, manyArgs[0]) } while (manyArgs.length > 2) return string.split(manyArgs[0]) } So, in your case, you could then call let array = splitByMany([" ", ","], 'My lo...
When an event has many possible outcomes, it is often of interest to count up the total number of possible outcomes. Other times, we want to know how many outcomes fulfill certain criteria. While counting may seem like a trivial task, it can become challenging when there are many compl...
Given the numbers 1,4,5,7,8, and 9, how many 4 digit numbers can be made that are not evenly divisible by two? Basic Counting Rule: Suppose there are n different tasks you have to accomplish, where n is a positive integer. For positive...