Question

which term of AP 3,8,13,18,......is 73?
a. 14
b. 15
c. 16
d. 17
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Answer 1

Answer:

An = a + (n - 1)d

73 = 3 + (n - 1) 5

n - 1 = 14

n=15

Therefore, the answer is b. 15.

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Answer 2

Step-by-step explanation:

here a=3 and d=5

→Sn=a+(n-1) ×d

→73= 3+(n-1) ×5

→73=3+5n-5

→73=-2+5n

→73+2=5n

→75=5n

→n=75/5

→n=15