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Binomial Theorem for Any Index

If 10m divide...

Question

If $10^{m}$ divides $101^{100} - 1$ , then the greatest value of $m$ is

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Solution

$101^{100} - 1 = (1 + 100)^{100} - 1 = 1 +^{100} C_{1} (100) +^{100} C_{2} (100)^{2} + \dots +^{100} C_{100} (100)^{100} - 1 =^{100} C_{1} (100) +^{100} C_{2} (100)^{2} + \dots +^{100} C_{100} (100)^{100} = 100^{2} (1 + k) = 10^{4} (1 + k)$
Where $k$ is multiple of $10$

Hence, the greatest value of $m$ is $4$

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Binomial Theorem for Any Index

Standard XIII Mathematics

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