Question

FORWARD, 25; BACKWARD, 10. Which of the following statements is true?

• A. $n_1=n_2$ if M = 10 and $n_1=0$
• B. M = 20 provided $n_1>0$
• C. $n_1>30$ provided M = 900
• D. $n_1=37$ provided M = 25

Answer 1

The correct option is A $n_1=n_2$ if M = 10 and $n_1=0$

FORWARD, 25; BACKWARD, 10 would effectively mean a FORWARD 15 i.e. $n_2-n_1=15$, (if $M-n_1>25$) and $n_2=M-10$ (if $M-n_1<25$). The only option that satisfies this is option (a). So if M = 10 and $n_1=0$, then $M-n_1<25$ and so $n_2=10-10=0$. Hence, $n_1=n_2$.