समांतर श्रेणी मे 2,7,12,,,,,,,,के 10 पद सुधी के plus किजिए।
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Step-by-step explanation:
sn= n/2 [2A+(n-1)×d]
a= 2
d= 5
n=10
sn= 10/2 [2×5+(10-1)×5]
= 5×[10+45]
=5× 55
=275
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