Math, asked by manjunathsudha55, 4 months ago

in an A.P if the first term is 4 and the 9th term is 28 find the sum of 9th term

Answers

Answered by Anonymous

2

Answer:

144

Step-by-step explanation:

a=4

T9=a+8d=28

4+8d=28

8d=24.d=3

sum of 9 terms=9/2( 2*4+8*3)

=9/2(32)

=144

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