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Question
In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.
In the Series 3, 9, 15, what will be the 21st term ?
In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.
In the Series 3, 9, 15, what will be the 21st term ?
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Solution
The correct option is C 123
Clearly, 3 + 6 = 9, 9 + 6 = 15, ....
So, the series is an A.P. in which a = 3 and d = 6.
∴21st term = a + (21 -1)d = a + 20d = 3 + 20 * 6 = 123.
Clearly, 3 + 6 = 9, 9 + 6 = 15, ....
So, the series is an A.P. in which a = 3 and d = 6.
∴21st term = a + (21 -1)d = a + 20d = 3 + 20 * 6 = 123.
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