How many ternary (0, 1, 2) sequences of length 10 are there without any pair of consecutive digits the same?

With #! i’ve tried to figure it out but i can’t.

Given: x + y = 6. if xe (-15, -6, -1), then which of the following sets of ordered pairs are solutions? © {(-15, -21), (-6, -12), (-1, -7)} [(-15, 21), (-6, , 7)} {(-15, 21), (-6, 12), (-1, -7)}

20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm