Question

please answer this question .......if correct i will mark as brainliest

Answer 1

Answer:

306

Step-by-step explanation:

1. abc is the number

2. c is even

3. Only a or b is an odd number

4. a+b+c= s is not a prime

5. c=2a

6. a+b+c= 3a ⇒ a+b+2a= 3a ⇒ 3a+b=3a ⇒ b=0

• As per 3. a is odd as b=0

• a= 1, 3, 5, 7, 9 ⇒ only a= 1 or a=3 options are possible as 2a=c <10

Options:

• a=1, c= 2- not accepted as sum of digits is prime
• a=3, c=6 - number = 306

Answer: 306

Answer 2

Let hundred digit =x  

ten digit =x−1

unit digit =x−1

First form of Number =100×x+100(x−1)+x+1

=111x−9

Second form of Number =(x+1)100+x×10+x−1

=111x+99

third form of number =(x−1)100+(x+1)10+x

=111x−90

So 111x−9+111x+99+111x−90=2664

111x=2664

x=8

So the number 8×100+7×10+9

=879