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In the given series, how many pairs of alternate numbers have a difference of 2?

641228742153862171413286

(a) One

(b) Two

(c) Three

(d) Four

Please find below the solution to the asked query:

$\mathrm{We}\mathrm{have}\phantom{\rule{0ex}{0ex}}641228742153862171413286\phantom{\rule{0ex}{0ex}}\mathrm{So}\mathrm{required}\mathrm{pair}\mathrm{are}\phantom{\rule{0ex}{0ex}}\left(4,2\right)\to 6\mathbf{4}1\mathbf{2}28742153862171413286\phantom{\rule{0ex}{0ex}}\left(1,3\right)\to 641228742\mathbf{1}5\mathbf{3}862171413286\phantom{\rule{0ex}{0ex}}\mathrm{Hence}\mathrm{option}\left(\mathrm{b}\right)\mathrm{is}\mathrm{correct}.$

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