What will be the 21st term of the series given below ? 3, 9, 15, ........ Option 1: 126 Option 2: 129 Option 3: 121 Option 4: 123

Answer: 123. Solution: The series is an AP with a = 3 and d = 6. a_21 = 3 + (21-1) x 6 = 3 + 120 = 123.

Logical Reasoning

Sequence & Series

Easy

What will be the 21st term of the series given below ?

3, 9, 15, ........

126

129

121

123

✅ Correct Option: 4

The series is an AP with $a = 3$ and $d = 6$ .

$a_{21} = 3 + (21-1) \times 6 = 3 + 120 = 123$ .

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