Question

8. The sum of the sequence 7 + 11 + 15
+.....239 is​

Answer 1

Answer:

7257

Step-by-step explanation:

a=7, d=4, an=239

a+(n-1)d=239

7+(n-1)4=239

7+4n-4=239

4n=239-3

n=236/4

n=59

s59= 59/2(7+239)

59/2(246)

59(123)

7257

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Answer 2

Step-by-step explanation:

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