How to know if a is included or not

#1

Sir how do we understand if we have to do csum[b]-csum[a] or csum[b] -csum[a-1] because if we do second method then a is also included if it is prime.

#2

Hey @adityamehrotra275
since both a and b are inclusive in range
we will do csum[b]-csum[a-1]

#3

Hey @adityamehrotra275
You got it right ?

#4

Yes Sir I got it Thanks

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#5

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