Answer:
a b
m n
the 2nd one
Step-by-step explanation:
Given:
The sum of two terms of GP is 6 and that of first four terms is
To find:
The sum of first six terms.
Solution:
We have,
Sum of first n terms of a GP is
...(i)
Putting n=2, we get
...(ii)
Putting n=4, we get
(Using (ii))
Divide both sides by 6.
Taking square root on both sides, we get
Case 1: If r is positive, then using (ii) we get
The sum of first 6 terms is
Case 2: If r is negative, then using (ii) we get
The sum of first 6 terms is
Therefore, the sum of the first six terms is 7.875.
113.04 is the volume
V = pi x r^2 x h
3.14 x 2^2 x 9 = 113.04
1.
15 × 12× 20
3600
2.
2×2×3
12
3.
24.3×8.5×9.7
2003.535
Answer:
the first function is correct