If a=3 and r=2 then find the sum up 5th term. - Vidyadip

MCQ

If a=3 and r=2 then find the sum up 5th term.

A
95
B
82
C
93
D
97

✓

Answer

93

Solution:

We know, $\text{s}_\text{n}=a\frac{\text({r^\text{n}-1)}}{\text({r}-1)}$

Here a = 3, r = 2 and n = 5

$\text{s}_5=3\frac{(2^5-1)}{(2-1)}$

$=3(32-1)=3\times31=93.$

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