In the given series, how many pairs of alternate numbers have a difference of 2?
641228742153862171413286
(a) One
(b) Two
(c) Three
(d) Four

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Please find below the solution to the asked query:

$$\begin{gathered} \mathrm{We} \mathrm{have} \\ 641228742153862171413286 \\ \mathrm{So} \mathrm{required} \mathrm{pair} \mathrm{are} \\ \left(4,2\right)\to 6\mathbf{4}1\mathbf{2}28742153862171413286 \\ \left(1,3\right)\to 641228742\mathbf{1}5\mathbf{3}862171413286 \\ \mathrm{Hence} \mathrm{option}\left(\mathrm{b}\right) \mathrm{is} \mathrm{correct}. \end{gathered}$$

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