plz answer the question I will mark you as brainlist
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a n= 3n+1
when n=1
a=4
when n=2
a2=7
Therefore, AP is 4,7,10,13.....
Sn=n/2(2a+(n-1)d)
S20= (20/2)(2(4)+19(3))
=10(8+57)
10(65)
=650
PLS MARK AS BRAINLIEST IF IT HELPED YOU :)
Answered by
0
a n= 3n+1
when n=1
a=4
when n=2
a2=7
Therefore, AP is 4,7,10,13.....
Sn=n/2(2a+(n-1)d)
S20= (20/2)(2(4)+19(3))
=10(8+57)
10(65)
=650
MARK ME THE BRAINLIEST PLS
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