Question

Sum of 100 odd numbers starting from 21

Answer 1

Answer:

a=T1=21

T2=23

T3=25

T4=27

d=T2-T1=23-21=2

n=100

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

Sn=100/2 {2×21+(50-1)×2}

Sn=50{42+49×2}

Sn=50{42+98}

Sn=50{140}

Sn=50×140

Sn=7000

so sum is 7000

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