Write the algebra of 10.18,26.... .calculate the sum of first 30 terms
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a=18
d=8
n=30
s30=n/2 [2a+(n-1)d]
30/2 [2×18+(30-1)8]
15 [36+29*8]
15 [36+232]
15 [268]
=4020
hopes it will help you
d=8
n=30
s30=n/2 [2a+(n-1)d]
30/2 [2×18+(30-1)8]
15 [36+29*8]
15 [36+232]
15 [268]
=4020
hopes it will help you
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