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Intheisan A.P the 20 tem is 40sum of 3rd and sth them16 find the A.P. |
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Answer» Answer: A.p of 20 TERM is 40. Then , a + 19d= 40 -(I) = And the sum of 3rd and 5th term is 16. a + 2d + a + 4d = 16 2a + 6d = 16 -( TAKE 2 common ) a + 3d = 8(ii) we get TWO equation , subtract equation ii by equation I a +19 d =40 a + 3d =8 = 16d =32 d =2 PUT the value of d in any equation . Then , you will be get first term (a). After , you will be get an A.P. |
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