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Product of Two Consecutive Even or Odd Natural Numbers

Find the valu...

Question

Find the value of the following without actually multiplying:
$13 \times 15$

A

165

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B

145

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C

156

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D

195

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Solution

The correct option is C 195
$13 \times 15$ $=$ $(14 - 1)$ $(14 + 1)$
$14^{2} - 1^{2}$ $=$ $195$
Hence, option D is correct.

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