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| 1. |
If 18,a,b,-3 are in A.P then a+b = ? |
| Answer» The answer is 15.Solution: 1st term of A.P(A) =184th term A.P = -3Therefore, -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 | |