Question

Find n, if first term is 8, nth
term of AP is 62. Sum of first n
terms is 210​

Answer 1

Answer:

a=8,an=62,sn=210

an=a+(n−1)d

62=8+(n−1)d

54=(n−1)d

Sn= 2n[2a+(n−1)d]

210= 2n[16+(n−1)d]

420=n[16+54]

420=70n

n=6

54=(6−1)d

d= 54/5

Step-by-step explanation:

hope it helps you :)