We have a property

Can we easily find the value of using the above property?

Similarly, we can find the values of , , etc. using the same property.

Remember that we choose values of a and b carefully so that we can minimize the calculation work.

What is the value of ?

(a) 6919

(b) 6289

(c) 6889

(d) 6959

(e) None of the above

Using property, , we have

Therefore, the answer is (c).

Now lets try three digit number. What is the value of

(A) 42209

(B) 40109

(C) 43209

(D) 41209

(E) None of the above

Using property, , we have

Hence, the answer is (D).

Now try some problems. Find the value of , and .