Question

if 6th term of an Ap is -10 and its 10th term of Ap is -20 find the 15 term of an Ap

Answer 1

Let first term be "a"
common difference be "d"

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Answer 2

a + 5d = -10

a+ 9d = -20

solving u get ....d = -5/2

by substituting........u will get a = 5

now a15 = 5+ 14 * -5/2

= 30