Question

If a number has an even number or zero at its unit place; the number is always divisible by ……. .
A. 2
B. 5
C. 3
D. 7

Answer 1

Day-1 MOCK TEST-1 Conceptual Quiz on Divisibility and Prime numbers. ... (2) x > n > k > 0 ... B)All prime factors of z^3 are greater than 7. ... C. x^0 + y^11 is a negative odd ...

Answer 2

If a number has an even number or zero at its unit place, the number is always divisible by 2 ( Option A).

Take an example, 52

Divisible by 2 : Yes

Divisible by 5 : No

Divisible by 3 : No

Divisible by 7 : No

Consider other example, 40

Divisible by 2 : Yes

Divisible by 5 : Yes

Divisible by 3 : No

Divisible by 7 : No

Consider other example, 94

Divisible by 2 : Yes

Divisible by 5 : No

Divisible by 3 : No

Divisible by 7 : No

We see that, Numbers with even numbers or 0 are Divisible by 2.

We already know that, For a number to be Divisible by 2 it should have 2, 4, 6, 8 ( even numbers) or 0 at the units place.

For divisibility by 5, Unit digit should be 0 or 5.

For divisibility by 3, Sum of digits should be Divisible by 3

For divisibility by 7, The Last digit is made double and subtracted from remaining number.

Therefore, a number has an even number or zero at its unit place; the number is always divisible by 2