The sum of the first 30 terms of an A.P. is 1920. If the fourth term is 18,
find its 11th term.
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The 11th term of an A.P=46
Step-by-step explanation:
Sum of nth terms of A.P is given by
Where n=Number of terms
a=First term
d=Common difference
n=30,
Substitute the values
....(1)
nth term of an A.P
Using the formula
...(2)
Equation (2) multiply by 2 and then subtract from equation (1)
Substitute the values of d in equation (2)
Hence, the 11th term=46
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