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The nth term of an A.P. is given by An =-4n+15. Find the 15th term and the common difference of the A.P. (Ans: a15 = -45, d = -4) |
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Answer» Answer: 15 th TERM = - 45 common DIFFERENCE = - 4 Step-by-step explanation: => An = - 4n + 15 => a + ( n - 1 ) d = - 4n + 15 => a + ( n - 1 ) d = 11 + ( n - 1 ) (-4)
COMPARING LHS and RHS a = 11 and d = - 4 15th term = 11 + 14x(-4) = 11 - 56 = - 45 |
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