Step-by-step explanation:

a;

we can directly do it by mind calculation .

add all the numbers if it is divisible by 3 then the number is divisible by three 7+a+2+5=14+a

so a=1,4,7

b;

b is 5 because it is odd number which is divisible by 5.

a=

8+a+5+4+5=22+a

a=2,5,8

sob

these r the values of a and b.

Write the values of a and b in the following odd numbers so that the number formed is divisible by 3 and 5

a) 7a25-7125

b) 8ab4b​ - 82245

Hope it help you.