Question

which term of the AP is 620 ?
10, 15, 20, ..
​

Answer 1

Answer:

Answer is in the image above:-

Answer 2

Step-by-step explanation:

yaha d=15-10=5

and a=10

tn=620

tn=a+(n-1)d

620=10+(n-1)*5

620-10=(n-1)*5

610/5=n-1

122=n-1

122+1=n

123=n

so 123 terms=620