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Given,
r = 1, then all terms are same:
a, a, a, ……a
Sn = a + a + a + a…… + upto n terms
= n × a.
Hence, option 4 is the correct option.
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The 12th term of the G.P. 2, 4, 8, 16, ……. is :
1024
2048
4096
8192