Question

in an AP the second term is 15 and the difference of the 5th term from the 15th term is 40.find the 20th term of the AP​
pls give step by step explanation

Answer 1

Answer:

The second term of an arithmetic progression (A.P.) is 15

a+d=15(1)  

where  a and  d is denotes the first term and common difference of the A.P., respectively.

The fifth term of the A.P. is 21

a+4d=21(2)  

(2)−(1)  

3d=6  

d=6/3  

d=2  

Substitute  d=2 in  (1)  

a+2=15  

a+2−2=15−2  

a=13

t20 = 13 + (19)(2)

      = 51

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Step-by-step explanation: