## Number System

1. The last digit of the number obtained by multiplying the numbers 41 x 42 x 43 x 44 x 45 x 46 x 47 x 48 x 49 will be ?
1. 0
2. 1
3. 4
4. 5
1. 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.

Report

1. The sum of the digits of a two digit number is 10, when the number is reversed, the number increases by 72.Find the number.
1. 64
2. 82
3. 19
4. 37
1. 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

Report

1. Find the product of place value and face value of 5 in 65231
1. 28000
2. 25000
3. 27000
4. 26000
1. 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

Report

1. The units digit in the product ( 784 x 618 x 917 x 463 ) is
1. 2
2. 3
3. 4
4. 5
1. 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

Report

1. If 1x5x01 is divisible by 11, then the value of x is
1. 6
2. 4
3. 8
4. 9
1. 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

Report