Explanation:

- Illegal: Unauthorized lotteries are considered unlawful as they do not conform to the legal framework established for lottery operations in India.

- Void: This term implies that any transactions or agreements related to an unauthorized lottery are null and hold no legal value. Any claim arising from such activities won't be legally enforceable.

- Both (a) and (b): This option combines the illegal and void nature of unauthorized lotteries, suggesting they are both unlawful and without legal effect.

- Neither (a) nor (b): This option would imply that unauthorized lotteries are neither illegal nor void, which is not correct.

The correct Answer is:

- Option 3: Both (a) and (b)