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1 + 2 + 3 + 4 + ..... + 50 =?

A1250

B1275

C1300

D1225

Answer:

B. 1275

Read Explanation:

ആദ്യത്തെ n എണ്ണൽ സംഖ്യകളുടെ തുക = n(n + 1)/2

1+2+3+4+.....+501 + 2 + 3 + 4 + ..... + 50

=50(50+1)/2=50(50+1)/2

=50×512=\frac{50\times51}{2}

=1275=1275


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