plz help in answering this with method and no silly answers.
=>#1,1.5,2,2.5,3...... upto 16 terms...#
@find the sum of first n terms of following A.P. @
(this question is from ch arithmetic progression.)
( Answer is 76)
(but I don't know method so plz help...)
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Sn = n/2 (2a + (n-1 )d )
n=16 ,d =0.5
S16 = 16/2(2×1 + 15×1/2)
= 8×19/2
= 76 ans
n=16 ,d =0.5
S16 = 16/2(2×1 + 15×1/2)
= 8×19/2
= 76 ans
saurabh198:
yess correct answer its an ap with d=.5
hmm
okkk
it s actually a nice answer
ya I know!!!
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