some important questions of AP
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1)Find the sum of the following A. P. 1,3,5,7..............,199
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Answer:a=1 d=2 an = 199
Sn = n/2 (2a+(n-1)d)
199=n/2(2×1+(n-1)2
199×2=n(2+2n-2)
398=2n+2n2-2n
398=0+2n2
398=2n2
N2=398/2
N2=199
N=root199
N=13
Step-by-step explanation:
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