Question

Find the number of terms of Ap 7,13,19......250

Answer 1

Answer:

here,

a=7

d=6

tn=250

we have to find the?

tn=a+(n-1)d

250=7+(n-1)6

250-7=6n-6

243+6=6n

249=6n

n=249/6

n=41

Answer 2

Answer:

1. t1 7

t2-t1 = 13-7= 6

1. t3-t2=19-13= 6
2. This is an ap
3. tn = a+(n-1)*d
4. 250 = 7+(n-1)*6
5. 250 =42 + (n-1)
6. 250-42 =n-1
7. 208 = n-1
8. n= 208+1
9. n=209