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Question : 117 of 150
Marks:
+1,
-0
Solution:
The given product
=2‌‌+‌‌+‌‌+‌‌+...=2s (say)
Now
S=‌‌+‌‌+‌‌+‌‌+... ....(1)
⇒‌‌S=‌‌+‌‌+‌‌+.....(2)
Apply (1)-(2)
⇒‌‌S=‌‌+‌‌+‌‌+....=‌‌=‌‌‌‌‌‌∴S=1⇒Product
=21=2
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