Question

Find the units digit of the number (1! x 2! x 3!) + 4! + 2!?
Select one:
O a. 5
b.4
O c.3
O d. 8​

Answer 1

Answer:

a is the correct answer please like follow and thanks because i am able to take answer your all questions

Answer 2

The correct answer is option (d) 8

Given:

(1! x 2! x 3!) + 4! + 2!

To find:

The units digit of the number (1! x 2! x 3!) + 4! + 2!

Solution:

As we know n! = 1 × 2 × 3 × 4.... n times (the product of n natural numbers)

⇒ 1! = 1 = 1

⇒ 2! = 2 × 1 = 2

⇒ 3! = 3 × 2 × 1 = 6

⇒ 4! = 4 × 3 × 2 × 1 = 24

From above values

(1! x 2! x 3!) + 4! + 2! =  (1 × 2 × 6) + 24 + 2

= 12 + 26 = 38  

Here, unit digit of 38 is 8

Therefore, (1! x 2! x 3!) + 4! + 2! = 38

⇒ Units digit of the number (1! x 2! x 3!) + 4! + 2! is 8

The correct answer is option (d) 8

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