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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Answered by
2
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
Answered by
0
Answer:
a15= -4×15+15
=-60+15
=-45
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