Question

which term of an AP : 7, 10,13....is 82​

Answer 1

Answer:

a=7,d=10-7=3,n=82

an=a+(n-1)d

an=7+(82-1)3

an=7+81*3

an=7+243

an=250

Answer 2

Answer:

6

Step-by-step explanation:

a = 7

d = 10 - 7 = 3

sn=n/2(2a+(n-1)d)

82=n/2 (2×7+(n-1)3)

82=n/2 (14+3n-3)

82=n/2 (11+3n)

174=11n+3nsquare

0=3nsquare+11n-174

0=3nsquare+29n-18n-174

so n=6 , n = -29/3

thank you