2) For a given A.Pt7 = 4, d = 4 then a =
(a) 6
(b) 7
(c) 20
(d) 28
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Given :-
7th term of AP = 4
Common difference = 4
Solution :-
t7 = a + ( n - 1 )d = 4
Put the required values in the formula ,
t7 = a + ( 7 - 1 )4 = 4
a + 28 - 4 = 4
a + 24 = 4
a = 4 - 24
a = -20
Hence , The value of a = -20
Related Formulas : -
- a + ( n - 1)d
Here , a is first term , n is no .of terms and d is common difference
- n/2 ( 2a +( n - 1)d )
Here, n is no. of terms , a is first term d is common difference .
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