Question

c) S3 = 21 + 23 + 25 + … + 1001

d) S5 = 1 + 4 + 7 + …+79

e) S6 = 15 + 17 + 19 + 21 + … + 151 + 153 + 155

f) S7 = 15 + 25 + 35 + …+115

g) S4 = 24 + 25 + 26 + … + 125 + 126

thank you. giúp mk với. Chiều nay mk thi rồi

Answer 1

tick cho mình nha

c) S3=(1001+21).491:2 = 250901

d) S5=(79+1).27:2=10

e) S6=(155+15).71:2=6035

f) S7= (115+15).21:2=1365

g) S4=(126+24).103:2=7725

Answer 2

c) S3=(1001+21).491:2 = 250901

d) S5=(79+1).27:2=10

e) S6=(155+15).71:2=6035

f) S7= (115+15).21:2=1365

g) S4=(126+24).103:2=7725