Question

I an ap given a=5 d=3 an=50 find n and S​

Answer 1

Answer:17,493

Step-by-step explanation:an=a+(n-1)d

an=5+(n-1)3

an=5+3n-3

an=3n-2

50=3n-2

52=3n

n=17

Sn=n/2{2a+(n-1)d}

S=17/2[10+16×3}

S=17/2×58

S=29×17

S=493