Question

The sum of the first five terms of the series 3+4*1/2+6*3/4.....
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Answer 1

Answer:

D= 9/2 - 3

3/2

S5= n/2*{2a + (n-1)d}

5/2{2×3 + ( 5-1) 3/2}

5/2(6 +4×3/2)

5/2(6+6)

5/2 × 12

30

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