MCQ
$\sum\limits_{n=1}^{7} \frac{n(n+1)(2 n+1)}{4}$ નો સરવાળો મેળવો.
- A$521$
- B$663$
- ✓$504$
- D$429$
$=\frac{1}{4}\left(2\left(\frac{7 \times 8}{2}\right)^{2}+3\left(\frac{7 \times 8 \times 15}{6}\right)+\frac{7 \times 8}{2}\right)$
$=504$
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વિધાન $2 :$ $\sim \left( {p \Leftrightarrow \sim q} \right)$ એ નિત્ય સત્ય છે.
$x\,\,\cos \,\,\frac{{\alpha + \beta }}{2}\,\, + \,\,y\,\,\sin \,\,\frac{{\alpha + \beta }}{2}\,\, = \,\,$