Question 175

Find the wrong number in the series. 7, 28, 63,124, 215, 342

Solution

By observing the terms of series it can be deduced that the series must follow the pattern
$$2^3 -1$$,$$3^3 -1$$,$$4^3 -1$$,$$5^3 -1$$,$$6^3 -1$$,$$7^3 -1$$
So option A is correct


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