Which of the following numbers will replace the question mark (?) in the given series?
3 ,30, 300 ,3000, ?

Given: 3 ,30, 300 ,3000, ?

Logic: Each number is getting its 10 times in next number.

3 $$\times$$ 10 = 30 ​

30 $$\times$$ 10 = 300

300 $$\times$$ 10 = 3000

Similarly,

3000 $$\times$$ 10 = 30000

Thus, correct option is (a).