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N is 16 using formula an=a+(n-1)d and sn can be calculated from here
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an=a+(n-1)d
50=5+(n-1)3
50-5=(n-1)3
45=(n-1)3
45/3=n-1
15=n-1
n=15+1
n=16
so the n is 16
50=5+(n-1)3
50-5=(n-1)3
45=(n-1)3
45/3=n-1
15=n-1
n=15+1
n=16
so the n is 16
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