The term to term rule is divide by 2 the third term of the sequence is 3 work out the first term

12

Step-by-step explanation:

if the term to term rule is to divide by two and the third term in the sequence is 3, you work backwards by multiplying by 2

So 3x2=6

6x2 = 12

Thus the first number is 12.

working forward again, you can check your answer. Divide 12 by 2, then divide 6 by 2 and you get 3, the third term if the sequence

12

Step-by-step explanation:

first = 12

second = 12/2 = 6

third = 6/2 = 3