MCQ
The first four terms of the sequence $a_n= 2n + 3$ are :
- A$\{3, 5, 7, 9\}$
- B$\{1, 3, 5, 7\}$
- ✓$\{5, 7, 9, 11\}$
- D$\{5, 8, 11, 14\}$
✓
Answer
Correct option: C.
$\{5, 7, 9, 11\}$
Given $an = 2n + 3$
$ \therefore a_1=2 \times 1+3=2+3=5 $
$ a_2=2 \times 2+3=4+3=7 $
$ a_3=2 \times 3+3=6+3=9 $
$ a_4=2 \times 4+3=11 $
$\therefore$ The first four terms are $\{5, 7, 9, 11\}.$
$ \therefore a_1=2 \times 1+3=2+3=5 $
$ a_2=2 \times 2+3=4+3=7 $
$ a_3=2 \times 3+3=6+3=9 $
$ a_4=2 \times 4+3=11 $
$\therefore$ The first four terms are $\{5, 7, 9, 11\}.$
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