The sum of first 50 even numbers and how
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S=2+4+6+8+... up to 50 terms
a=2,d=4−2=2 and n=50
∴ Sn=2n[2a+(n−1)d]
= 250[2×2+(50−1)×2]
= 50[2+49]
= 50×51=2550
∴ Sum of 50 even natural numbers=2550
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