If $$2^a × 5^b = 500,$$ and a and b are integers, then a + b is ​

Correct option is A

Given:
We are given:

 $$2^a × 5^b = 500,$$​ where a and b are integers.
We are to find the value of a + b.

Solution:
Step 1: Prime factorize 500
500 = 2 × 250
= 2 × 2 × 125
= 2² × 5³

So,
$$2^a × 5^b$$​ = 2² × 5³

Thus,
a = 2, b = 3

Now:
a + b = 2 + 3 = 5

Final Answer:
S. Ans. (A) 5