find the sum of 2 + 3×1÷2 + 5 6×1÷2 +.......upto 25 terms
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Answered by
3
Step-by-step explanation:
sir 5?6 ider konsa sing ayega
Answered by
3
Step-by-step explanation:
Answers
Let:
a=first term
d=common difference
AP=3,9/2,6.........
d=9/2-3
=9-6/2
=3/2=1.5
Given:a=3
So
Sn=n/2*[2a+(n-1)d]
S25=25/2*[6+(25-1)1.5]
=25/2[6+24*1.5]
=25/2*[6+36]
=25/2*42
=25*21
=525.
That's the answer: 525.
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