9 ke pratham 15 gunjo ka yog gyat kijiye test paper hindi medium
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Step-by-step explanation:
series= 9,18,28.....,135
sum of series=15/2(135+9)
=15/2×144
=15×72
=1080
second process
formula= t.n.(n+1)/2
where t is table n is no. of terms
so, sum = 9×15×16/2
=135×8
=1080
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