Dear expert, why the above sum is done so elaborately?? Why is it not done in short as follows:
a=1, l=11
Therefore, Sn=n/2(a+l)
or, 36=n/2(1+11)
or, 36=(n/2)*12
or, 36=6n
or, n=6
Dear expert, why the above sum is done so elaborately?? Why is it not done in short as follows:a=1, l=11
Therefore, Sn=n/2(a+l)
or, 36=n/2(1+11)
or, 36=(n/2)*12
or, 36=6n
or, n=6 —+ C httpsJfm•av
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Q: The sum
APi$ 27 and the sum of lhgir
Arithmeti c Progressions
Page :
194
1942
'946
1948
1949
Q: Sol•æ this:
provo that
n AM's are
Answer 7:
a— 1, 36
. 11
11
—I + (n— II
Should it not be sum of 25
of 31
then
alm in A P
(n 10
Also, sn = 36
n{2+10} = 72
= 36
(Using (I))
210-2017
