What is the next in series for 2, 3, 6, 18, 108, ..?
- 208
- 1944
- 2008
- 2020
Formula used will be – s(n) = s(n-1) × s(n-2)
2 × 3 = 6
3 × 6 = 18
6 × 18 = 108
108 × 18 = 1944
Formula used will be – s(n) = s(n-1) × s(n-2)
2 × 3 = 6
3 × 6 = 18
6 × 18 = 108
108 × 18 = 1944
Solution:
Age of Mansoor = 2
Age of Laila = 4×2=8
After 1 year
Mansoor’s age = 3
Laila’s age = 9
After 2 years
Mansoor’s age = 4
Laila’s age = 10
After 3 years
Mansoor’s age = 5
Laila’s age = 11
After 4 years
Mansoor’s age = 6
Laila’s age = 12
So, Mansoor’s age is 6 years when he is half the age of her older sister Laila.
Solution:
(a+b+c)/3=45
a+b+c=135—–(1)
(a+b)/2=40
a+b=80——-(2)
(b+c)/2=43
b+c=86——(3)
add(2) and (3)
a+b+c+b=80+86=166
135+b=166
b=166-135=31 Kg