Question

find 50th term of ap whose 11th term is 38 and16 term is 78​

Answer 1

Answer:

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α11= 38

α16= 78

____________

to find-

a50=?

_____________

solution-

a11= a+ 10d= 38 equation 1

a16= a+ 15d= 78 equation 2

by solving the equation we get

5d= 40

d= 40/5= 8

putting the value of d in any of the equation we will get a

a+ 80= 38

a= -42

a50= a+ 49d= -42+49 x 8= 392-42= 350