Question

If d (N) represents number of divisors of N then
d (18) is

Answer 1

Answer:

d(18)=6

Step-by-step explanation:

The divisors of 18 are 1,2,3,6,9,18. It is an abundant composite number.

Answer 2

Answer:

Required value of d(18) is 6.

Step-by-step explanation:

Given,d(N) represents number of divisors of N.

A number that divides another number either completely or with remainder is called divisor.

For example divisors of 4 is 1,2 and 4 itself.

Here N = 18

d(18) represent number of divisors of 18.

Now divisors of 18 are 1,2,3,6,9,18.

So numbers of divisors of 18 are 6.

So required value of d(18) is 6.

This is a problem of Algebra.

Some important Algebra formulas.

(a + b)² = a² + 2ab + b²

(a − b)² = a² − 2ab − b²

(a + b)³ = a³ + 3a²b + 3ab² + b³

(a - b)³ = a³ - 3a²b + 3ab² - b³

a³ + b³ = (a + b)³ − 3ab(a + b)

a³ - b³ = (a -b)³ + 3ab(a - b)

a² − b² = (a + b)(a − b)

a² + b² = (a + b)² − 2ab

a² + b² = (a − b)² + 2ab

a³ − b³ = (a − b)(a² + ab + b²)

a³ + b³ = (a + b)(a² − ab + b²)

Know more about Algebra,

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