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If (a,b,c) are in AP and each term is multiplied by (t), what will be the new common difference?

Answer and explanation

Correct answer: (t(b-a))

The direct answer is option C,
\(t(b-a)\). Since
\((a,b,c)\) is an AP, its common difference is
\(b-a"); equivalently,
\(c-b=b-a\). After multiplying every term by
\(t"), the new terms are
\(ta,tb,tc"). Their consecutive difference is
\(tb-ta=t(b-a)"). The next difference is
\(tc-tb=t(c-b)=t(b-a)"), so the result is consistent. Option A,
\(b-a"), is the old difference and misses the scaling by t. Option B,
\(t"), is only the multiplier, not generally the new difference. Option C is correct. Option D,
\(a+t"), adds t to one term and does not describe multiplying all terms. If t is negative, the formula still works and reverses the direction as appropriate. Exam cue: multiplying all AP terms by t multiplies d by t.

Related tags

ApScalingTransformation

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