3 and 4 .Determinants and Matrices
normal

જો $A = \left[ {\begin{array}{*{20}{c}}
p&{13}\\
{ - 13}&p
\end{array}} \right]$ અને  $B = \left[ {\begin{array}{*{20}{c}}
{4q}&{85}\\
{ - 2}&1
\end{array}} \right]$  કે જ્યાં  $p,q \in N$ છે અને  $\left| A \right| = \left| B \right|$ અને  $p,q \in[1,1000]$ આપેલ હોય તો $(p,q)$ ની કુલ ક્રમયુક્ત જોડની મેળવો.

A

$31$

B

$35$

C

$41$

D

$23$

Solution

$p^{2}+169=4 q+170$

$p^{2}=4 q+1$

Let $\mathrm{p}=(2 \mathrm{k}+1) \Rightarrow \mathrm{q}=\mathrm{k}(\mathrm{k}+1)$

$1 \leq k(k+1) \leq 1000$

Number of possible values are $31 .$

Standard 12
Mathematics

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