This is the Important question based on Arithmetic progression Chapter R.S Aggarwal book for ICSE & CBSE Board.
Here the AP is given. you have to find the nth term of given AP
This is the Question Number 6 Exercise 11 A of RS Aggarwal Solution.
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Find the 25th term of the AP 5, 4_1 /2 , 4, 3_1 /2 , 3, ……….
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Given AP is 5, 4_1 /2 , 4, 3_1 /2 , 3, ……….
Here First Term a=5
To Find the nth Term of the above AP
Common Difference
d=4_1 /2 -5= -1/2
n=25
a_n = a+(n-1)d
a_25 = 5 + (25-1)(-1/2)
= -7