Answer: part 1 n = 20 d = 3 so, a+(n-1)d is formula to find term . putting value in this formula a+ (20-1)3 = 59 => a+ 19×3 = 59 => a+ 57 = 59 => a = 59-57 => a = 2 part 2 a= 2 d= 3 n= 15 so putting in a+(n-1)d 2 + (15-1) 3 => 2 + 14 × 3 => 2+ 42 44 is 15th term of an AP Reply

Answer:part 1

n = 20

d = 3

so,

a+(n-1)d is formula to find term .

putting value in this formula

a+ (20-1)3 = 59

=> a+ 19×3 = 59

=> a+ 57 = 59

=> a = 59-57

=> a = 2

part 2

a= 2

d= 3

n= 15

so putting in a+(n-1)d

2 + (15-1) 3

=> 2 + 14 × 3

=> 2+ 42

44 is 15th term of an AP