Step 1:
Life insurance is not a contract of indemnity.
Step 2:
The principle of contribution applies mainly to indemnity insurance like fire or marine insurance.
It does not apply to life insurance.
Step 3:
Total insured amount:
\[
20,00,000 + 30,00,000
\]
\[
= 50,00,000
\]
Step 4:
Therefore, legal representatives will receive:
\[
\boxed{₹50,00,000}
\]
Hence, the correct answer is:
\[
\boxed{\text{(3)}}
\]