Asked by John
In sequence given by TN=a+bn , the 7th and 15th terms are 19 and 43 respectively find the value of a and b
Answers
Answered by
oobleck
so form equations using the two terms:
a+7b = 19
a+15b = 43
subtract and you get
8b = 24
b = 3
so a = -2
a+7b = 19
a+15b = 43
subtract and you get
8b = 24
b = 3
so a = -2
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