all formulas of arithmetic progresion class 10th
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an term =a+(n-1)d
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.... sum of an term of integer is ......sn =a/2(an+a)
....
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.... sum of an term of integer is ......sn =a/2(an+a)
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an =a+(n_1)d
Tn=a+(n_1)d
Sn=n/2(a+l)
c.d=d2-d1
Tn=a+(n_1)d
Sn=n/2(a+l)
c.d=d2-d1
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