Instructions
In the following number series only one number is wrong. Find the wrong number.
Solution
In this question we can see that
154 - 129 = 25 = $$(5)^2$$
203 - 154 = 49 = $$(7)^2$$
284 - 203 = 81 = $$(9)^2$$
405 - 284 = 121 = $$(11)^2$$
but when we see the first two terms from left side
129 -130 = 1 and hence we can say that the odd term is 130 as it should be 120
hence correct answer is A
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