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# please help

 P: 4 I need to write a program to find the sum, sum of squares, sum of the cubes, and sum of a certain series shown below for the first n integers, begining with 1 and ending with n = 100. Summing the first 100 natural numbers: ................................. n(n+1) 1 + 2 + 3 + ..... + n = ---------- ....................................... 2 Sum of squares of the first 100 natural numbers: ...................................... n(n+1)(2n+1) 1² + 2² + 3² + ……. n² = ------------------- .................................................. 6 Sum of cubes of the first 100 natural numbers: ............................................. n² (n + 1)² 1³ + 2³ + 3³ + ……. + n³ = -------------- .................................................. 4 Another series: ...1........... 1............ 1........................ 1............... n ------- + ------- + ---------- + .......... ---------- = .....-------- (1 * 2)... (2 * 3).... (3 * 4).............. n*(n+1) ........... n +1 Since all of these series involve summing the same number of terms, do all of the summing inside ONE(1) loop. Compute the formats outside the loop. Use n as a variable in the formulas; do not replace it with 100, because the formulas work for any n and the program should be flexible enough to easily change the number of terms. Nov 14 '06 #1
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 10K+ P: 13,264 I need to write a program to find the sum, sum of squares, sum of the cubes, and sum of a certain series shown below for the first n integers, begining with 1 and ending with n = 100. Summing the first 100 natural numbers: ................................. n(n+1) 1 + 2 + 3 + ..... + n = ---------- ....................................... 2 Sum of squares of the first 100 natural numbers: ...................................... n(n+1)(2n+1) 1² + 2² + 3² + ……. n² = ------------------- .................................................. 6 Sum of cubes of the first 100 natural numbers: ............................................. n² (n + 1)² 1³ + 2³ + 3³ + ……. + n³ = -------------- .................................................. 4 Another series: ...1........... 1............ 1........................ 1............... n ------- + ------- + ---------- + .......... ---------- = .....-------- (1 * 2)... (2 * 3).... (3 * 4).............. n*(n+1) ........... n +1 Since all of these series involve summing the same number of terms, do all of the summing inside ONE(1) loop. Compute the formats outside the loop. Use n as a variable in the formulas; do not replace it with 100, because the formulas work for any n and the program should be flexible enough to easily change the number of terms. What have got so far? Nov 14 '06 #2

 P: 24 unless and untill you start something no one is going to help you. You try first and then ask if you have any queries. Nov 14 '06 #3

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