if an = ( n+4)(n+5)(n+6),then S10=
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n=1
a=(5)(6)(7)
a=210
n=10
a10=3360
Sn=n/2[a+an]
S10=10/2[210+3360]
=5[3570]
=17850
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I hope it helpful I think u r 9th class of sri chaitanya school
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