D. Sequences and series

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arithmetic

Maths

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4 Terms

1
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nth term

un=a+(n-1)d

2
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to find n (no. of terms)

n=((l-a)/d)+1

3
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sum of n terms

sn=n/2(a+l)

4
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sum of n terms

sn=n/2(2a+(n-1)d)