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Best answer

$60,40,55,45,50,50,$______

We can take the alternative numbers from the first term.

- $60 \overset{-5}{\rightarrow} 55$
- $55 \overset{-5}{\rightarrow} 50$
- $50 \overset{-5}{\rightarrow} {\color{Magenta}{45}}$

We can take the alternative numbers from the second term.

- $40 \overset{+5}{\rightarrow} 45$
- $45 \overset{+5}{\rightarrow} 50$

So, the correct answer is $(A).$