how many term of the series 1 + 5 + 9 + and so on must be taken so that their sum is 190?
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Answer:
n=48
Step-by-step explanation:
1+5+9+.......................................
a=1 ,d=5-1=4 ,Sn=190
Sn=2a+(n-1)d
190=2(1)+(n-1)4
190=2+4n-4
190=4n-2
4n=190+2
4n=192
n=192/4
n=48
therefore ,48 terms to be taken
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