Question

Find the number of terms common to the two AP's 3,7,11,.....407 and 2,9,16,.....709​

Answer 1

Ap's= 3,7,11,....407

common difference

d= a2 - a1= a3 - a2

7-3=11-7

4 = 4

now,

an = a+ (n-1)d