Last digit will be multiplication of 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9.
It includes 5 & 2.

Correct Option: A

Last digit will be multiplication of 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9.
It includes 5 & 2.
So, 5 x 2=10,
0 will be the last digit.

Go through the options.

Correct Option: C

By checking options
91-19=72

Or

Let the number be xy
So 10x + y = 10 ..... (i)

When the number is reversed the new number is yx
So (10y + 10 ) - ( 10x +y ) = 72 ....(ii)

From Eqs. (i) & (ii)
x = 1 and y =9
∴number = 19

Place value of 5 in 65231 = 5 x 1000
Face value = 5

Correct Option: B

Place value of 5 in 65231 = 5 x 1000
= 5000

Face value = 5

required product = 5000 x 5 = 25000

Units digit in the given product = Units digit of 4 x 8 x 7 x 3

Correct Option: A

Units digit in the given product = Units digit of 4 x 8 x 7 x 3
= Units digit of 672
= 2

N/A

Correct Option: C

When a number is divisible by 11, then sum of numbers at even place - sum of numbers at odd place = 0 or divisible by 11.

( x + x + 1 ) - ( 1+ 5 + 0 ) = 11
⇒ 2x - 5 = 11
∴ x = 8