Question

How many terms of the series 3+7+11+........ must be taken to get a sum of 1176? ANS-24

Answer 1

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Answer 2

a=3
d=4
Sn=1176
formula=Sn= [2a+(n-1)d]n/2
1176/n=2+4n
2n^2+n-1176

factors are 48,49
n=24
n=-49/2

therefore 24 teens must be taken to get a sum of 1176