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If 18,a,b,-3 are in A.P then …

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If 18,a,b,-3 are in A.P then a+b = ?

Posted by Dhasvinth .S 6 years ago

CBSE > Class 10 > Mathematics

1 answers

Ujjwal Pandey 6 years ago

The answer is 15. Solution: 1st term of A.P(A) =18 4th term A.P = -3 Therefore, -3 = A+(n-1)d -3 = 18+(4-1)d -3-18 = 3d -21 = 3d d= -7. So , a= 18 - 7 a = 11. b = 11 - 7 b = 4. Therefore, a + b = 11 + 4 = 15

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