(a)first term=2
(n)no of term=10
(r)common ratio=8/2=4
sn={a(r^n-1)}÷(r-1)
s1o={2(4^10-1)}÷(4-1)
s10={2(1048576-1)}÷3
s10=2097150÷3
s1o=699050
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