Choose the correct alternative that will...

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
In the series 3,9,15,.... What will be the 21st term?

A

117

B

121

C

123

D

129

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The correct Answer is:

C

Clearly, 3+ 6 = 9,9+ 6 = 15,…..
So, the series is an A.P. in which a = 3 and d = 6.
Therefore 21st term = `a + (21 - 1) d = a + 20d = 3 + 20 xx 6 = 123`.

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