Question 43

Select the correct option that will complete the series.
13, 42, 129, 390, .......

Solution

$$13\times3+3 = 39+3 = 42$$

$$42\times3+3 = 126+3 = 129$$

$$129\times3+3 = 387+3 = 390$$

$$390\times3+3 = 1170+3 = 1173$$

Hence 1173 will come in place of blank.

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