Question
श्रेणी $2\sqrt 2 + \sqrt 2 + 0 + .....$ का $8$ वाँ पद होगा
यहाँ $a = 2\sqrt 2 ,\;d = - \sqrt 2 $
अत: श्रेणी का $8$ वाँ पद
$ = 2\sqrt 2 + (8 - 1)( - \sqrt 2 ) = - 5\sqrt 2 $.
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