FORWARD, 10; FORWARD, 10. Which of the following statements about the above instructions is true?

n_{1} - n_{1} = 20

only if

n_{1} = 0

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n_{2} - n_{1} = 20

if M>20 and

n_{1} = 1

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n_{2} - n_{1} = 10

if M = 21 and

n_{1} = 0

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n_{2} > n_{1}

if M > 0

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Solution

The correct option is B $n_{2} - n_{1} = 20$ if M>20 and $n_{1} = 1$
FORWARD, 10; FORWARD, 10 would effectively mean a FORWARD 20 i.e., $n_{2} - n_{1} = 20$ , (if $M - n_{1} \geq 20$ ) or $n_{2} = M$ (if $M - n_{1} < 20$ ). The option that satisfies this condition is (b), as if M > 20 and $n - 1 = 1$ , then $M - n_{1} > 20$ , and hence $n_{2} - n_{1} = 20$ .

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