MCQ
Which of the following is not an $A.P.?$
- A$\{-1.2, -3.2, -5.2, -7.2, ...\}$
- B$\{a, 2a, 3a, 4a, ...\}$
- ✓$\{2, 4, 8, 16, ...\}$
- D$\{2, 5252, 3, 7272, ...\}$
✓
Answer
Correct option: C.
$\{2, 4, 8, 16, ...\}$
In $\{2, 4, 8, 16, ...\}$
$d=a_2-a_1=4-2=2$
And $d=a_3-a_2=8-4=4$
Also $d=a_4-a_3=16-8=8$
Here, the common difference is not the same for all terms,
$\therefore$ it is not an $AP.$
$d=a_2-a_1=4-2=2$
And $d=a_3-a_2=8-4=4$
Also $d=a_4-a_3=16-8=8$
Here, the common difference is not the same for all terms,
$\therefore$ it is not an $AP.$
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