pls do this its urgent
this is of 50 points
Answers
Answer:
1. All of these
2. (b), (c), (d) are not progression..
3. common difference is 0 becoz common difference is a2 - a1 so,..
4 - 4= 0
4. an = n/n+2
put n=1,
a1 = 1/1+2..
a1 = 1/3
similarily .....put n = 5,, u will get 5th term of this AP.....
a5 = 5/5+2
= 5/7
5. an= 2n - 1
firstly,,....find first two terms of the AP then subtract them...
put n= 1..
a1 = 2×1 - 1
= 1
put n = 2..
a2 = 2×2 - 1
= 4 - 1
= 3
Now for finding common difference,,....
subtract both the terms..
common difference(d) = 3 - 1
= 2
7. Two digits No. divisible by 3 are 12, 15, 18 .....99
a1 = 12,, an= 99
a2 = 15,,.... common difference(d) = a2- a1
= 15-12= 3
The formula for finding two digits no. divisible by 3(n)...
an= a+(n-1)d
put values from above in this formula....
99 = 12+ (n-1)3
99-12= (n-1)3
87 = (n-1)3
n= 30
30 two digits no..will be divisible by 3..
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Answer:
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