Question

Qual a soma dos 50 primeiros números ímpares

Answer 1

1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43+45+47+49+51.53+55+57+59+61+63+65+67+69+71+73+75+77+79+81+83+85+87+89+91+93+95+97+99= 2,500

Answer 2

resolução!

an = a1 + ( n - 1 ) r

an = 1 + ( 50 - 1 ) 2

an = 1 + 49 * 2

an = 1 + 98

an = 99

Sn = ( a1 + an ) n / 2

Sn = ( 1 + 99 ) 50 / 2

Sn = 100 * 25

Sn = 2500