Question

19th term of an AP equal 7 times the second term and 12th term of the AP exceed 5 times the 3rd term by 2.
Find the first term and common difference

Answer 1

Answer:

Step-by-step explanation:

aa =7a*2

a12=5a3+2

a+8d=7{a+d}

a+8d={7a+7d}

d= 6a

a+11d=5{a+2d}2

a+11d ={5a+10d}+2

d=4a+2

6a-4a=2{ putting the value d=6a}

2a=2

find the d

d=6*1

d= 6 hence proved