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ICSE Class 10 Answered

Please solve this question step by step according to ICSE board.   *Find the 10th term from the end of the A. P.  4,9,14,.................254
Asked by krcraju1973 | 17 May, 2019, 09:40: AM
Expert Answer
 
Reverse the A.P as we have to find the nth term from the end.
→ 254,  ..... 14, 9, 4.
 
Here a = 254 , d = 4 - 9 = (-5) 
 
To find:
t10 = ?
We know that nth term of an A.P is given by,

tn = a + (n - 1)d 
→t10  = 254 + (10 - 1)(-5) = 254 - 45 = 209
 


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