1. The
The nth
term
an
an AP is
og
tom as
25
b) 26
C) 27
d)
28
go on
7
AB= 6cm and BC= 8cm
2. In Ale ABC B ²
then AC is
a) 9 cm
b) 10cm
() 12cm
d) 5cm
AP
3. The sum of the first in
in terms
of 엉
re
sonr2at(n-1)d] b) S- [2 a fn-1)d] (c)
15:26 [2at in +1] d) a
den [zat (n-1) d]
Answers
Answered by
0
Answer:
Step-by-step explanation:
Given, T
n
=7−3n.
Let us try to reaarange it into the form, T
n
=a+(n−1)d
where a is the first term,n is the number of terms and d is the common difference.
T
n
=7−3n
⇒ T
n
=4+3−3n
⇒ T
n
=4−3(n−1)
So,here a=4,d=−3
Sum of n terms in an AP can be calculated using the formula
S
n
=
2
n
(a+T
n
)
⇒ S
n
=
2
n
(4+7−3n)
⇒ S
n
=
2
n
(11−3n)
⇒ S
n
=
2
25
(−64) (∵n=25)
⇒ S
n
=−800
∴ No Option
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