Question

1+2+3+..............+n=666
Then find n

Answer 1

Answer:

500- blank answer n is equal to 100

Answer 2

Answer:

36

Step-by-step explanation:

a=1

Sn=666

n=?

d=1

Sn=n/2(2a+(n-1)d)

666=n/2(2×1+(n-1)1)

666=n/2(2+n-1)

666=n/2(1+n)

666=n+n sq/2

666×2=n+n sq

1332=n+n sq

n sq+n -1332=0

n sq +37n -36n -1332=0

n(n+37)-36(n+37)=0

n=-37 OR n=36

rejecting first case because N cant be in negative ...

so n=36