Hard Question Series💪🏻

2021-09-07 15:41:32 > A/C => (240-80)/(240+80) => 1/2 { spd }

> 2 : 1 => 4 : 2 { tym A : C }

> B tyn => (4+2)/2 => 3

> 4 : 3 : 2 [ tym ]
> 3k : 4k : 6k [ spd ]

> 240/3k - 240/4k = 1
> k => 20 kmph

> C-A => 3k => 60 kmph Open / Comment

2021-09-04 19:09:46 X ,y and z are speeds of bikes respectively
D/Z - D/Y=D/Y -D/X
2/Y =1/x+1/z---(1)
(240+80)/x=(240-60)/Y +1
1/x -1/240=1/y---(2)
Putting 1/y in (1)
1/x=1/z +1/120---(3)
320/z=160/x
X=2z putting in (3)
X=60
Z=120
Difference=120-60=60 Open / Comment

2021-09-04 19:09:46 Open / Comment

2021-08-15 17:41:54 1/12 + 1/9 +1/6 + 1/4 +1/3 =34/36

B= 1/2*34/36= 17/36

C = 2*36/[(51-36)/5]= 24 hrs Open / Comment

2021-08-15 17:41:54 Open / Comment

2021-08-09 18:34:04 Sum(1 + n/2 + n²/2)

n + n(n + 1)/4 + n(n + 1)(2n + 1)/12

Put n = 20

20 + 105 + 1235

1560 Open / Comment

2021-08-09 18:31:30 n= (1,2,3...)
So,
1st term = 1+1/2 +1/2 = 1+1 = 2
2nd = 1+2/2 +4/2 = 4
3rd = 1+3/2 +9/2 = 7
4th = 1+4/2 +16/2 = 11
So,
Series will be = 2,4,7,11,16,22,29,37, 46, 56, 67, 79, 92, 106, 121, 137, 154, 172, 191, 211
So,
Common difference is not same so, its not a AP series,

Adding = 1560

D Open / Comment

2021-08-09 18:31:29 Open / Comment

2021-08-08 20:05:29 Open / Comment

2021-08-08 20:04:13 Open / Comment