Consider the following statements:

1. Burial techniques determine the socio-economic differences amongst people living within a particular culture.

2. Harappan people did not believe in an afterlife.

3. The Higher denominations of weights were binary (1, 2, 4, 8, 16, 32, etc. up to 12,800), while the lower denominations followed the decimal system.

Which of the above statements is/are incorrect?