Problems need HardWork #4

If p p is a prime, how many factors does ­ p 3 p^3 have?

6 2 3 1 4

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7 solutions

P × P × P = P × P × P × 1 P\times P \times P=P \times P \times P \times1

There are 4 \boxed{4} distinct factor. It can't be others because P P is a prime, and 1 1 has only 1 divisor.

Trial and error is best, example take 2. 2 cube = 8. We know factors of 8= 1,2,4,8. So 4 factors.

Sai Krishna Varanasi - 5 years, 9 months ago

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Um... I don't think so.

Adam Phúc Nguyễn - 5 years, 9 months ago
Dev Sharma
Aug 22, 2015

Given that p is prime, the factors of p^3 are: 1, p, p^2, and p^3

I personally think "divisors" is a better word here.

Isaac Buckley - 5 years, 9 months ago

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Same, the word factor made me think it wanted all the prime factors

Steven Kingston - 5 years, 9 months ago
Chew-Seong Cheong
Aug 22, 2015

p 3 = { 1 × p 3 p × p 2 p^3 = \begin{cases} 1 \times p^3 \\ p \times p^2 \end{cases} . Therefore, there are 4 \boxed{4} factors: 1 1 , p p , p 2 p^2 and p 3 p^3 .

nice suggestion sir. Many more such problems in my set

Dev Sharma - 5 years, 9 months ago
Sahar Bano
Mar 21, 2020

P^3 is divisible by 1, P, P^2, P^3

Hence there are 4 factors

Nicholas Tanvis
Sep 2, 2015

Prime factorisation of p 3 p^3 would still be p 3 p^3 as p is prime. The number of factors of an integer we assume a n a^n , is n + 1 n+1 . This also works on ( a n ) ( b m ) (a^n)*(b^m) , number of factors would still be ( n + 1 ) ( m + 1 ) (n+1)(m+1) .

Jun Arro Estrella
Aug 26, 2015

If p^3 is prime, It has 4 factors namely 1, p, p^2, p^3

Solomon Hailu
Aug 26, 2015

The factors of p^3 are: p, p^2, p^3, and 1. Hence 4 distinct factors.

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